A250750 - cp's OEIS frontend

A250750 Number of (n+1) X (3+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	129
2	423
3	1353
4	4239
5	13089
6	40023
7	121593
8	367839
9	1109649
10	3341223
11	10048233
12	30193839
13	90679809
14	272236023
15	817101273
16	2452090239
17	7357843569
18	22076676423
19	66236320713
20	198721545039
21	596189800929
22	1788619734423
23	5365959866553

[129, 423, 1353, 4239, 13089, 40023, 121593, 367839, 1109649, 3341223, 10048233, 30193839, 90679809, 272236023, 817101273, 2452090239, 7357843569, 22076676423, 66236320713, 198721545039, 596189800929, 1788619734423, 5365959866553]

cp's OEIS Frontend

A250750 Number of (n+1) X (3+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