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A198475 Number of 2nX4 0..2 arrays with values 0..2 introduced in row major order and each element equal to an odd number of horizontal and vertical neighbors 1
12, 252, 6104, 153222, 3935188, 101884208, 2646874462, 68861880812, 1792520780552, 46671361129270, 1215282911633348, 31646146096635168, 824083171352362894, 21459718004443762012, 558827923845866912376 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A198477

LINKS

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

FORMULA

Empirical: a(n) = 45*a(n-1) -520*a(n-2) -74*a(n-3) +16486*a(n-4) +129736*a(n-5) -1095201*a(n-6) -2191939*a(n-7) +10377776*a(n-8) +9527308*a(n-9) +306527440*a(n-10) +393254288*a(n-11) -3528330816*a(n-12) -16775802368*a(n-13) -71215672320*a(n-14) +113359953920*a(n-15) +1277760061440*a(n-16) +1211880046592*a(n-17) +3312362192896*a(n-18) -7949471711232*a(n-19) -128862239326208*a(n-20) -76892799500288*a(n-21) -597198022639616*a(n-22) +1365043685883904*a(n-23) +15832967439974400*a(n-24) -12508044277579776*a(n-25) -66428094503714816*a(n-26) +72057594037927936*a(n-27)

EXAMPLE

Some solutions for n=3

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

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

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

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

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

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

CROSSREFS

Sequence in context: A210484 A099139 A289565 * A035013 A065583 A129585

Adjacent sequences:  A198472 A198473 A198474 * A198476 A198477 A198478

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 25 2011

STATUS

approved

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Last modified February 20 04:32 EST 2020. Contains 332063 sequences. (Running on oeis4.)