A250521 - cp's OEIS frontend

A250521 Number of (n+1)X(2+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)-x(i-1,j) in the j direction.

n	a(n)
1	222
2	1180
3	5029
4	18859
5	65310
6	214812
7	682921
8	2122743
9	6501118
10	19720580
11	59462069
12	178644459
13	535616774
14	1604254580
15	4803055177
16	14379531399
17	43056528118
18	128955131820
19	386326404261
20	1157662173067
21	3469836562702

[222, 1180, 5029, 18859, 65310, 214812, 682921, 2122743, 6501118, 19720580, 59462069, 178644459, 535616774, 1604254580, 4803055177, 14379531399, 43056528118, 128955131820, 386326404261, 1157662173067, 3469836562702]

cp's OEIS Frontend

A250521 Number of (n+1)X(2+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)-x(i-1,j) in the j direction.

Table of values

List of values