A211911 - cp's OEIS frontend

A211911 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)/2-2.

n	a(n)
1	0
2	1
3	6
4	25
5	70
6	156
7	301
8	526
9	855
10	1315
11	1936
12	2751
13	3796
14	5110
15	6735
16	8716
17	11101
18	13941
19	17290
20	21205
21	25746
22	30976
23	36961
24	43770
25	51475
26	60151
27	69876
28	80731
29	92800
30	106170
31	120931
32	137176
33	155001
34	174505
35	195790
36	218961
37	244126
38	271396
39	300885

[0, 1, 6, 25, 70, 156, 301, 526, 855, 1315, 1936, 2751, 3796, 5110, 6735, 8716, 11101, 13941, 17290, 21205, 25746, 30976, 36961, 43770, 51475, 60151, 69876, 80731, 92800, 106170, 120931, 137176, 155001, 174505, 195790, 218961, 244126, 271396, 300885]

cp's OEIS Frontend

A211911 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)/2-2.

Table of values

List of values