A236121 Number of (n+1)X(2+1) 0..3 arrays colored with the sets of distinct values in every 2X2 subblock

3096, 91128, 2692656, 79581792, 2351803200, 69503976144, 2054050501536, 60703643502048, 1793980782096336, 53017712120412048, 1566838135293043152, 46304936839913066208, 1368454795385648565600, 40442092322085834910464

Offset

1,1

Comments

Column 2 of A236123

Links

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

Formula

Empirical: a(n) = 14*a(n-1) +405*a(n-2) +1830*a(n-3) -4691*a(n-4) -47998*a(n-5) -55581*a(n-6) +505153*a(n-7) +1001824*a(n-8) -3123526*a(n-9) -5008625*a(n-10) +10507909*a(n-11) +11310434*a(n-12) -17345214*a(n-13) -7739207*a(n-14) +1315249*a(n-15) +11274820*a(n-16) -7267628*a(n-17) -6244408*a(n-18) +11830548*a(n-19) +7508592*a(n-20) -544968*a(n-21)

Example

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

Crossrefs

Sequence in context: A251871 A206132 A187305 * A252884 A103523 A345519

Adjacent sequences: A236118 A236119 A236120 * A236122 A236123 A236124

Keyword

nonn

Author

R. H. Hardin, Jan 19 2014

Status

approved