A233051 Number of (2+1)X(n+1) 0..2 arrays x(i,j) with row sums sum{j*x(i,j), j=1..n+1} nondecreasing, and column sums sum{i^2*x(i,j), i=1..2+1} nondecreasing

117, 1112, 8494, 55833, 321015, 1643645, 7654949, 32878503, 131625788, 495839830, 1770680805, 6031355004, 19703984612, 62024181142, 188838365213, 557980426201, 1604875696815, 4504699403782, 12367743536793, 33281266235062

Offset

1,1

Comments

Row 2 of A233049

Links

Table of n, a(n) for n=1..20.

Example

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

Crossrefs

Sequence in context: A327599 A326064 A233376 * A278774 A219990 A223749

Adjacent sequences: A233048 A233049 A233050 * A233052 A233053 A233054

Keyword

nonn

Author

R. H. Hardin, Dec 03 2013

Status

approved