A144926 - cp's OEIS frontend

A144926 Number of n X n (-1,1)-circulant matrices with determinant 0.

n	a(n)
0	0
1	0
2	4
3	2
4	8
5	2
6	40
7	2
8	128
9	62
10	504
11	2
12	1768
13	2
14	6864
15	2738
16	24192
17	2
18	107128
19	2
20	331096
21	109334
22	1410864
23	2
24	5880544
25	206282
26	20801200
27	5417630
28	73508696
29	2
30	345334744
31	2
32	1150681600
33	278770214
34	4667212440
35	133401818
36	19355912632
37	2
38	70690527600
39	15151534406

[0, 0, 4, 2, 8, 2, 40, 2, 128, 62, 504, 2, 1768, 2, 6864, 2738, 24192, 2, 107128, 2, 331096, 109334, 1410864, 2, 5880544, 206282, 20801200, 5417630, 73508696, 2, 345334744, 2, 1150681600, 278770214, 4667212440, 133401818, 19355912632, 2, 70690527600, 15151534406]

cp's OEIS Frontend

A144926 Number of n X n (-1,1)-circulant matrices with determinant 0.

Table of values

List of values