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A198522 Number of nX2 0..4 arrays with values 0..4 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors 1
2, 15, 193, 3660, 81844, 1948672, 47436498, 1163606279, 28617909415, 704465305625, 17346617064022, 427184684002131, 10520398796919219, 259092051772297458, 6380839372392481249, 157145577058895542027 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A198528

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n) = 35*a(n-1) -267*a(n-2) +246*a(n-3) +924*a(n-4) +710*a(n-5) -1736*a(n-6) -1860*a(n-7) +72*a(n-8) +1984*a(n-9) +720*a(n-10) -320*a(n-11) -512*a(n-12) for n>14

EXAMPLE

Some solutions for n=4

..0..0....0..1....0..0....0..1....0..1....0..1....0..1....0..0....0..1....0..0

..0..1....2..0....1..0....2..3....2..0....2..0....0..2....0..1....2..3....1..2

..2..3....2..2....2..3....4..2....1..0....0..2....1..3....1..0....1..2....1..3

..2..2....3..1....0..1....0..3....2..1....2..3....0..0....0..0....1..0....1..2

CROSSREFS

Sequence in context: A052819 A328121 A127090 * A187655 A046249 A042355

Adjacent sequences:  A198519 A198520 A198521 * A198523 A198524 A198525

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 26 2011

STATUS

approved

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Last modified November 19 16:06 EST 2019. Contains 329320 sequences. (Running on oeis4.)