A232455 Number of nX4 0..2 arrays with every 0 next to a 1 and every 1 next to a 2 horizontally, vertically, diagonally or antidiagonally

15, 3015, 187989, 12521603, 865692227, 59192688269, 4047993038079, 276984506979883, 18950464526945069, 1296525832007000487, 88704539492832641819, 6068900612790047496325, 415216038771799950697787

Offset

1,1

Comments

Column 4 of A232459

Links

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

Formula

Empirical: a(n) = 51*a(n-1) +885*a(n-2) +20314*a(n-3) +51242*a(n-4) -287165*a(n-5) -7238521*a(n-6) -20969007*a(n-7) -20079258*a(n-8) +379758092*a(n-9) +987349124*a(n-10) +1940213292*a(n-11) -3615001480*a(n-12) -3551344432*a(n-13) +653913792*a(n-14) +2673844992*a(n-15)

Example

Some solutions for n=3
..1..0..2..2....1..2..2..1....1..2..1..0....0..0..2..1....1..2..1..2
..0..2..0..0....1..0..1..2....2..0..0..0....1..0..2..2....0..1..2..1
..2..2..2..1....1..2..1..0....0..1..2..1....2..2..1..1....2..1..1..1

Crossrefs

Sequence in context: A208411 A249965 A108281 * A208579 A080691 A208584

Adjacent sequences: A232452 A232453 A232454 * A232456 A232457 A232458

Keyword

nonn

Author

R. H. Hardin, Nov 24 2013

Status

approved