A250808 - cp's OEIS frontend

A250808 Number of (n+1) X (4+1) 0..2 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	441
2	1731
3	6171
4	20631
5	66291
6	207831
7	641571
8	1961031
9	5955891
10	18013431
11	54331971
12	163579431
13	491905491
14	1478051031
15	4438822371
16	13325805831
17	39996095091
18	120025640631
19	360151632771
20	1080604320231
21	3242111804691

[441, 1731, 6171, 20631, 66291, 207831, 641571, 1961031, 5955891, 18013431, 54331971, 163579431, 491905491, 1478051031, 4438822371, 13325805831, 39996095091, 120025640631, 360151632771, 1080604320231, 3242111804691]

cp's OEIS Frontend

A250808 Number of (n+1) X (4+1) 0..2 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