

A232151


Number of 3Xn 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally, diagonally or antidiagonally


1



1, 145, 3669, 67725, 1345057, 27888353, 572956549, 11720173753, 239945876241, 4914834120181, 100662128740253, 2061578515560877, 42221864226950145, 864724020040862701, 17709947243340576177, 362707660633719422837
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OFFSET

1,2


COMMENTS

Row 3 of A232149


LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210


FORMULA

Empirical: a(n) = 15*a(n1) +68*a(n2) +683*a(n3) +4587*a(n4) +1332*a(n5) 32302*a(n6) 47941*a(n7) 49247*a(n8) 33578*a(n9) +48420*a(n10) +25707*a(n11) +23404*a(n12) +22761*a(n13) +1376*a(n14) +2938*a(n15) 66*a(n16) 640*a(n17) +368*a(n18) 240*a(n19)


EXAMPLE

Some solutions for n=4
..1..2..2..1....1..1..2..1....0..0..2..1....0..1..0..2....1..2..0..1
..2..2..2..0....0..2..1..2....1..1..2..1....1..2..2..2....1..1..2..2
..2..0..1..2....2..0..2..2....0..2..0..1....2..1..2..1....0..0..0..2


CROSSREFS

Sequence in context: A296972 A269015 A234116 * A264284 A008377 A076464
Adjacent sequences: A232148 A232149 A232150 * A232152 A232153 A232154


KEYWORD

nonn


AUTHOR

R. H. Hardin, Nov 19 2013


STATUS

approved



