A268419 - cp's OEIS frontend

A268419 Number of n X 1 0..3 arrays with every repeated value in every row unequal to the previous repeated value, and in every column equal to the previous repeated value, and new values introduced in row-major sequential order.

n	a(n)
1	1
2	2
3	5
4	14
5	44
6	147
7	505
8	1750
9	6065
10	20950
11	72052
12	246715
13	841345
14	2858714
15	9682221
16	32700942
17	110173948
18	370393059
19	1242869721
20	4163561358
21	13927246329
22	46526402422
23	155249799428
24	517505902283
25	1723457914689
26	5734951039346

[1, 2, 5, 14, 44, 147, 505, 1750, 6065, 20950, 72052, 246715, 841345, 2858714, 9682221, 32700942, 110173948, 370393059, 1242869721, 4163561358, 13927246329, 46526402422, 155249799428, 517505902283, 1723457914689, 5734951039346]

cp's OEIS Frontend

A268419 Number of n X 1 0..3 arrays with every repeated value in every row unequal to the previous repeated value, and in every column equal to the previous repeated value, and new values introduced in row-major sequential order.

Table of values

List of values