A226990 Number of nX4 0..4 arrays of sums of 2X2 subblocks of some (n+1)X5 binary array with rows and columns of the latter in lexicographically nondecreasing order

21, 313, 2820, 24158, 180712, 1187869, 6897735, 35818171, 168412446, 725322952, 2890248513, 10747422169, 37565694126, 124186120157, 390330632256, 1171738349385, 3372578086357, 9339039810942, 24954235842112, 64510189847669

Offset

1,1

Comments

Column 4 of A226992

Links

R. H. Hardin, Table of n, a(n) for n = 1..62

R. H. Hardin, Empirical polynomial of degree 31

Formula

Empirical polynomial of degree 31 (see link above)

Example

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

Crossrefs

Sequence in context: A317201 A281254 A157088 * A016321 A019041 A021214

Adjacent sequences: A226987 A226988 A226989 * A226991 A226992 A226993

Keyword

nonn

Author

R. H. Hardin Jun 25 2013

Status

approved