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A237969 Number of (n+1)X(3+1) 0..3 arrays with the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one 1
7905, 59014, 369068, 2609908, 20123780, 149625960, 1103412332, 8201125448, 61392928964, 454158172752, 3384197190198, 25127260995252, 187313795410528, 1387556859816504, 10349189174713490, 76751150630045768, 572086176964557556 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A237974

LINKS

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

FORMULA

Empirical: a(n) = 2894*a(n-4) +44487*a(n-6) -1503817*a(n-8) -30896235*a(n-10) +210299314*a(n-12) +4888817325*a(n-14) -14506815710*a(n-16) -273679187459*a(n-18) -437518653104*a(n-20) +9172444092579*a(n-22) +56036113474638*a(n-24) -195310008842740*a(n-26) -938665468143984*a(n-28) +2927054715784732*a(n-30) +2688466221818800*a(n-32) -21148892074250088*a(n-34) -56644046711903024*a(n-36) -9144467048901376*a(n-38) +77073773917450080*a(n-40) +63947939728517856*a(n-42) -43340863596329664*a(n-44) -24828004482833664*a(n-46) -1848578704883712*a(n-48) for n>53

EXAMPLE

Some solutions for n=2

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

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

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

CROSSREFS

Sequence in context: A045292 A115426 A206069 * A256163 A171111 A155178

Adjacent sequences:  A237966 A237967 A237968 * A237970 A237971 A237972

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 16 2014

STATUS

approved

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Last modified November 13 10:29 EST 2019. Contains 329093 sequences. (Running on oeis4.)