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A269039 Number of 5Xn 0..2 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling two exactly once. 1
0, 1944, 12228, 146064, 1326576, 13031664, 119790816, 1105914780, 9987532176, 89650751964, 796324353216, 7029528437100, 61650349082232, 537978900955440, 4672818187679448, 40427882184540648, 348530963947264848 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 5 of A269035.

LINKS

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

FORMULA

Empirical: a(n) = 12*a(n-1) +26*a(n-2) -566*a(n-3) -123*a(n-4) +8804*a(n-5) -4121*a(n-6) -59620*a(n-7) +55115*a(n-8) +183692*a(n-9) -256127*a(n-10) -211910*a(n-11) +498819*a(n-12) -48036*a(n-13) -371692*a(n-14) +214008*a(n-15) +43848*a(n-16) -64656*a(n-17) +8640*a(n-18) +5184*a(n-19) -1296*a(n-20) for n>22

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Cf. A269035.

Sequence in context: A203890 A200656 A201047 * A300199 A252151 A235003

Adjacent sequences:  A269036 A269037 A269038 * A269040 A269041 A269042

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 18 2016

STATUS

approved

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Last modified June 2 08:00 EDT 2020. Contains 334767 sequences. (Running on oeis4.)