A250693 - cp's OEIS frontend

A250693 Number of (2+1)X(n+1) 0..3 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.

n	a(n)
1	520
2	2920
3	13906
4	60508
5	249512
6	995624
7	3894542
8	15061244
9	57914756
10	222291368
11	853854042
12	3287692860
13	12701872800
14	49262782920
15	191821043814
16	749801489244
17	2941369935292
18	11575782602248
19	45685412767666
20	180742482085084

[520, 2920, 13906, 60508, 249512, 995624, 3894542, 15061244, 57914756, 222291368, 853854042, 3287692860, 12701872800, 49262782920, 191821043814, 749801489244, 2941369935292, 11575782602248, 45685412767666, 180742482085084]

cp's OEIS Frontend

A250693 Number of (2+1)X(n+1) 0..3 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.

Table of values

List of values