A358629 - cp's OEIS frontend

A358629 a(n) is the number of signed permutations W of V = (1, 2, ..., n) such that the dot product V*W = 0.

n	a(n)
1	0
2	2
3	0
4	16
5	48
6	558
7	4444
8	62246
9	692598
10	11722730
11	196824592
12	3896202680
13	86626174698
14	2018770217402
15	51681142218502
16	1418482891697258
17	41404316055037624
18	1304323691188387488
19	43501661519771535260
20	1538705372277647632786

[0, 2, 0, 16, 48, 558, 4444, 62246, 692598, 11722730, 196824592, 3896202680, 86626174698, 2018770217402, 51681142218502, 1418482891697258, 41404316055037624, 1304323691188387488, 43501661519771535260, 1538705372277647632786]

cp's OEIS Frontend

A358629 a(n) is the number of signed permutations W of V = (1, 2, ..., n) such that the dot product V*W = 0.

Table of values

List of values