A211912 - cp's OEIS frontend

A211912 Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any horizontal, vertical, diagonal or antidiagonal neighbor, and containing the value n(n+1)/2-3.

n	a(n)
1	0
2	1
3	10
4	214
5	1946
6	10431
7	40561
8	127275
9	342434
10	820396
11	1794811
12	3649471
13	6986365
14	12714404
15	22162596
16	37221766
17	60519231
18	95631155
19	147337624
20	221925796
21	327546796
22	474632341
23	676377395

[0, 1, 10, 214, 1946, 10431, 40561, 127275, 342434, 820396, 1794811, 3649471, 6986365, 12714404, 22162596, 37221766, 60519231, 95631155, 147337624, 221925796, 327546796, 474632341, 676377395]

cp's OEIS Frontend

A211912 Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any horizontal, vertical, diagonal or antidiagonal neighbor, and containing the value n(n+1)/2-3.

Table of values

List of values