A208018 - cp's OEIS frontend

A208018 Number of n X 3 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal, vertical, diagonal or antidiagonal neighbor (colorings ignoring permutations of colors).

n	a(n)
1	2
2	7
3	270
4	27093
5	5252041
6	1688298227
7	819147302097
8	562766251199622
9	522687453434959180
10	633631710314384052082
11	975235769907492737264795
12	1863659976446678796423595540
13	4341202639797991970260869847084
14	12137362722177750192276998364963783

[2, 7, 270, 27093, 5252041, 1688298227, 819147302097, 562766251199622, 522687453434959180, 633631710314384052082, 975235769907492737264795, 1863659976446678796423595540, 4341202639797991970260869847084, 12137362722177750192276998364963783]

cp's OEIS Frontend

A208018 Number of n X 3 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal, vertical, diagonal or antidiagonal neighbor (colorings ignoring permutations of colors).

Table of values

List of values