A236259 Number of (n+1)X(1+1) 0..3 arrays colored with the sets of distinct values in every 2X2 subblock, with new values 0..3 introduced row-major order.

15, 132, 1571, 18995, 230395, 2794651, 33899863, 411212991, 4988112515, 60506987731, 733964167055, 8903159915783, 107997447907963, 1310034734765851, 15891032984074183, 192762010484105103, 2338249044226166771

Offset

1,1

Comments

Column 1 of A236262

Links

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

Formula

Empirical: a(n) = 6*a(n-1) +60*a(n-2) +158*a(n-3) +205*a(n-4) -68*a(n-5) -408*a(n-6) -96*a(n-7) +144*a(n-8) for n>9

Example

Some solutions for n=4
..0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..0....0..1....0..1
..2..3....0..2....2..2....0..1....0..2....2..0....2..2....0..1....2..2....2..0
..0..2....1..3....2..0....2..2....2..2....1..3....1..1....2..2....3..2....1..3
..2..0....2..3....1..3....3..0....1..1....1..2....1..3....3..1....1..2....3..3
..3..3....0..3....2..2....1..3....0..1....3..0....0..2....1..3....1..1....1..0

Crossrefs

Sequence in context: A236262 A227814 A369416 * A348212 A289421 A201138

Adjacent sequences: A236256 A236257 A236258 * A236260 A236261 A236262

Keyword

nonn

Author

R. H. Hardin, Jan 21 2014

Status

approved