A186087 - OEIS

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A186087

Number of (n+2)X(n+2) 0..4 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order

102251, 22559052, 4527262140, 837192826927, 142701733009836, 22643128901373831, 3389319838308873682, 482195323502778740280, 65081669155365981380613, 8294413388145189171875895

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Diagonal of A186096

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for 4X4

..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0

..0..0..1..2....0..0..0..1....0..0..1..3....0..0..0..3....0..0..1..3

..0..2..2..4....0..0..1..2....0..1..0..2....0..2..3..3....0..1..1..1