A187699 - cp's OEIS frontend

A187699 T(n,k)=Number of (n+1)X(n+1) 0..k arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection.

n	a(n)
1	6
2	50
3	0
4	192
5	8
6	104
7	512
8	74
9	7954
10	0
11	1126
12	280
13	87258
14	1548
15	9350
16	2146
17	784
18	692410
19	22738
20	15128848
21	0
22	3760
23	1970
24	2363474
25	320674
26	1089964504
27	454640
28	4280018
29	6112
30	3580
31	10839282
32	1147854

[6, 50, 0, 192, 8, 104, 512, 74, 7954, 0, 1126, 280, 87258, 1548, 9350, 2146, 784, 692410, 22738, 15128848, 0, 3760, 1970, 2363474, 320674, 1089964504, 454640, 4280018, 6112, 3580, 10839282, 1147854]

cp's OEIS Frontend

A187699 T(n,k)=Number of (n+1)X(n+1) 0..k arrays with each 2X2 subblock determinant nonzero and the array of 2X2 subblock determinants symmetric under horizontal and vertical reflection.

Table of values

List of values