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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 1
21, 313, 2820, 24158, 180712, 1187869, 6897735, 35818171, 168412446, 725322952, 2890248513, 10747422169, 37565694126, 124186120157, 390330632256, 1171738349385, 3372578086357, 9339039810942, 24954235842112, 64510189847669 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 26 17:38 EDT 2019. Contains 323597 sequences. (Running on oeis4.)