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A266011 Number of nX7 integer arrays with each element equal to the number of horizontal and antidiagonal neighbors equal to itself. 1
1, 4, 27, 75, 486, 2208, 10708, 53384, 255936, 1264666, 6155158, 30091959, 147181798, 718659407, 3513986897, 17168832194, 83908881411, 410071803548, 2003955083279, 9793599928641, 47860794887575, 233897163096237 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 7 of A266012.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +12*a(n-2) +35*a(n-3) +11*a(n-4) -18*a(n-5) -253*a(n-6) -68*a(n-7) -142*a(n-8) +353*a(n-9) +167*a(n-10) +285*a(n-11) +263*a(n-12) -218*a(n-13) +383*a(n-14) -581*a(n-15) +430*a(n-16) -544*a(n-17) -75*a(n-18) -27*a(n-19) -240*a(n-20) +501*a(n-21) -210*a(n-22) +252*a(n-23) -144*a(n-24) for n>28

EXAMPLE

Some solutions for n=4

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

..2..2..1..2..1..2..2....2..2..1..2..2..2..2....1..2..1..1..2..2..2

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

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

CROSSREFS

Cf. A266012.

Sequence in context: A122406 A276372 A071837 * A015238 A298987 A070600

Adjacent sequences:  A266008 A266009 A266010 * A266012 A266013 A266014

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 20 2015

STATUS

approved

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Last modified September 21 23:55 EDT 2019. Contains 327286 sequences. (Running on oeis4.)