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A266014 Number of 4Xn integer arrays with each element equal to the number of horizontal and antidiagonal neighbors equal to itself. 1
1, 1, 14, 9, 27, 61, 75, 281, 697, 1182, 3379, 8083, 17008, 44193, 103747, 232714, 571581, 1342911, 3114718, 7472335, 17554474, 41147561, 97770072, 230189903, 541916214, 1282131187, 3021086562, 7122374217, 16823787888, 39666365638 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row 4 of A266012.

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-3) +a(n-4) +14*a(n-5) +31*a(n-6) +28*a(n-7) +17*a(n-8) -69*a(n-9) +124*a(n-10) -41*a(n-11) -174*a(n-12) -347*a(n-13) -293*a(n-14) +611*a(n-15) -1613*a(n-16) -496*a(n-17) -15*a(n-18) +1102*a(n-19) +2041*a(n-20) -4267*a(n-21) +7710*a(n-22) +4851*a(n-23) +741*a(n-24) +945*a(n-25) -5239*a(n-26) +16978*a(n-27) -16478*a(n-28) -21208*a(n-29) +4426*a(n-30) -7104*a(n-31) +466*a(n-32) -37612*a(n-33) +11472*a(n-34) +49808*a(n-35) -12912*a(n-36) +1664*a(n-37) +14944*a(n-38) +28288*a(n-39) +1536*a(n-40) -45056*a(n-41) +20480*a(n-42) +12288*a(n-43) -22528*a(n-44) for n>53

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A266012.

Sequence in context: A035418 A070602 A206641 * A086050 A128486 A147370

Adjacent sequences:  A266011 A266012 A266013 * A266015 A266016 A266017

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 20 2015

STATUS

approved

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Last modified August 18 08:57 EDT 2019. Contains 326077 sequences. (Running on oeis4.)