A250731 - cp's OEIS frontend

A250731 Number of (2+1) X (n+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.

n	a(n)
1	18
2	46
3	110
4	257
5	596
6	1376
7	3173
8	7310
9	16838
10	38777
11	89300
12	205640
13	473549
14	1090478
15	2511134
16	5782577
17	13315988
18	30663728
19	70611701
20	162602894
21	374438006
22	862246697
23	1985560724
24	4572300824
25	10528983005
26	24245885486
27	55832834510

[18, 46, 110, 257, 596, 1376, 3173, 7310, 16838, 38777, 89300, 205640, 473549, 1090478, 2511134, 5782577, 13315988, 30663728, 70611701, 162602894, 374438006, 862246697, 1985560724, 4572300824, 10528983005, 24245885486, 55832834510]

cp's OEIS Frontend

A250731 Number of (2+1) X (n+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.

Table of values

List of values