

A279488


Number of nX2 0..1 arrays with no element equal to a strict majority of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.


1



1, 0, 5, 18, 68, 235, 801, 2678, 8777, 28343, 90455, 285812, 895302, 2783602, 8598096, 26404831, 80671908, 245328807, 742945582, 2241375512, 6738536925, 20194613731, 60344058090, 179828931783, 534560389757, 1585341579329, 4691443265544
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OFFSET

1,3


COMMENTS

Column 2 of A279494.


LINKS

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


FORMULA

Empirical: a(n) = 7*a(n1) 15*a(n2) +11*a(n3) 8*a(n4) 9*a(n5) +34*a(n6) +17*a(n7) +30*a(n8) +41*a(n9) +a(n10) 18*a(n11) 24*a(n12) 33*a(n13) 24*a(n14) 8*a(n15) a(n16)


EXAMPLE

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


CROSSREFS

Cf. A279494.
Sequence in context: A318062 A158879 A322497 * A199843 A109438 A164051
Adjacent sequences: A279485 A279486 A279487 * A279489 A279490 A279491


KEYWORD

nonn


AUTHOR

R. H. Hardin, Dec 13 2016


STATUS

approved



