A204678 - cp's OEIS frontend

A204678 Number of n X 1 0..3 arrays with no occurrence of three equal elements in a row horizontally, vertically, diagonally or antidiagonally, and new values 0..3 introduced in row major order.

n	a(n)
1	1
2	2
3	4
4	12
5	40
6	143
7	528
8	1979
9	7466
10	28246
11	106992
12	405481
13	1537042
14	5826959
15	22091016
16	83752328
17	317527448
18	1203835147
19	4564081020
20	17303737555
21	65603438014
22	248721498050
23	942974761824
24	3575088704597
25	13554190277870

[1, 2, 4, 12, 40, 143, 528, 1979, 7466, 28246, 106992, 405481, 1537042, 5826959, 22091016, 83752328, 317527448, 1203835147, 4564081020, 17303737555, 65603438014, 248721498050, 942974761824, 3575088704597, 13554190277870]

cp's OEIS Frontend

A204678 Number of n X 1 0..3 arrays with no occurrence of three equal elements in a row horizontally, vertically, diagonally or antidiagonally, and new values 0..3 introduced in row major order.

Table of values

List of values