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A266010 Number of nX6 integer arrays with each element equal to the number of horizontal and antidiagonal neighbors equal to itself. 1
2, 1, 18, 61, 154, 473, 1561, 4909, 15560, 49716, 158446, 505111, 1610417, 5134905, 16372772, 52204960, 166458078, 530758391, 1692351797, 5396146261, 17205878204, 54861813048, 174929641642, 557771939947, 1778483829141, 5670785032981 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A266012.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +3*a(n-2) +6*a(n-3) -4*a(n-4) -14*a(n-5) -29*a(n-6) +2*a(n-7) -a(n-8) +36*a(n-9) -20*a(n-10) -16*a(n-11) +4*a(n-12) +84*a(n-13) +60*a(n-14) +96*a(n-15) -16*a(n-16) +16*a(n-17) +48*a(n-18) +64*a(n-19) for n>21

EXAMPLE

Some solutions for n=4

..0..1..2..2..1..0....0..1..2..2..2..2....1..1..0..1..1..0....1..1..0..2..2..2

..1..2..2..1..2..2....1..2..1..1..2..1....0..2..2..0..1..1....0..1..2..1..2..1

..1..1..0..2..2..1....2..2..2..2..1..0....2..2..1..2..2..1....1..2..1..2..1..0

..0..1..1..0..1..0....0..1..1..0..1..1....0..1..2..2..1..0....2..2..2..0..1..1

CROSSREFS

Cf. A266012.

Sequence in context: A089014 A063426 A316195 * A181870 A070890 A123907

Adjacent sequences:  A266007 A266008 A266009 * A266011 A266012 A266013

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 20 2015

STATUS

approved

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Last modified October 26 08:00 EDT 2021. Contains 348267 sequences. (Running on oeis4.)