A204227 Number of (n+1) X 6 0..2 arrays with the sums of 2 X 2 subblocks nondecreasing rightwards and downwards.

49284, 2173565, 87487117, 2019310610, 45791699846, 687853333430, 10297878073062, 113754005579615, 1254605391285859, 10988697166912314, 96030748646457765, 701414832964037835, 5107498255064984418

Offset

1,1

Comments

Column 5 of A204230.

Links

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

Example

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

Crossrefs

Cf. A204230.

Sequence in context: A054730 A253379 A253372 * A205279 A185921 A251912

Adjacent sequences: A204224 A204225 A204226 * A204228 A204229 A204230

Keyword

nonn

Author

R. H. Hardin Jan 13 2012

Status

approved