A210694 - cp's OEIS frontend

A210694 T(n,k)=Number of (n+1)X(n+1) -k..k symmetric matrices with every 2X2 subblock having sum zero.

n	a(n)
1	5
2	13
3	9
4	25
5	35
6	17
7	41
8	91
9	97
10	33
11	61
12	189
13	337
14	275
15	65
16	85
17	341
18	881
19	1267
20	793
21	129
22	113
23	559
24	1921
25	4149
26	4825
27	2315
28	257
29	145
30	855
31	3697
32	10901
33	19721
34	18571
35	6817
36	513
37	181
38	1241
39	6497
40	24583
41	62281
42	94509
43	72097
44	20195
45	1025
46	221
47	1729
48	10657
49	49575

[5, 13, 9, 25, 35, 17, 41, 91, 97, 33, 61, 189, 337, 275, 65, 85, 341, 881, 1267, 793, 129, 113, 559, 1921, 4149, 4825, 2315, 257, 145, 855, 3697, 10901, 19721, 18571, 6817, 513, 181, 1241, 6497, 24583, 62281, 94509, 72097, 20195, 1025, 221, 1729, 10657, 49575]

cp's OEIS Frontend

A210694 T(n,k)=Number of (n+1)X(n+1) -k..k symmetric matrices with every 2X2 subblock having sum zero.

Table of values

List of values