A211905 - cp's OEIS frontend

A211905 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 or vertical neighbor, and containing the value n(n+1)/2-2.

n	a(n)
1	0
2	2
3	10
4	34
5	86
6	181
7	337
8	575
9	919
10	1396
11	2036
12	2872
13	3940
14	5279
15	6931
16	8941
17	11357
18	14230
19	17614
20	21566
21	26146
22	31417
23	37445
24	44299
25	52051
26	60776
27	70552
28	81460
29	93584
30	107011
31	121831
32	138137
33	156025
34	175594
35	196946
36	220186
37	245422
38	272765
39	302329

[0, 2, 10, 34, 86, 181, 337, 575, 919, 1396, 2036, 2872, 3940, 5279, 6931, 8941, 11357, 14230, 17614, 21566, 26146, 31417, 37445, 44299, 52051, 60776, 70552, 81460, 93584, 107011, 121831, 138137, 156025, 175594, 196946, 220186, 245422, 272765, 302329]

cp's OEIS Frontend

A211905 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 or vertical neighbor, and containing the value n(n+1)/2-2.

Table of values

List of values