A118705 - cp's OEIS frontend

A118705 a(n) = determinant of n X n circulant matrix whose first row is the first n triangular numbers A000217(0), A000217(1), ... A000217(n-1).

n	a(n)
1	0
2	-1
3	28
4	-1360
5	105500
6	-12051585
7	1908871832
8	-400855203840
9	107838796034520
10	-36175347978515625
11	14806446317943766420
12	-7263073394295238840320
13	4206546078973080241293076
14	-2840250692354398785860048105
15	2211476237421629752792968750000

[0, -1, 28, -1360, 105500, -12051585, 1908871832, -400855203840, 107838796034520, -36175347978515625, 14806446317943766420, -7263073394295238840320, 4206546078973080241293076, -2840250692354398785860048105, 2211476237421629752792968750000]

cp's OEIS Frontend

A118705 a(n) = determinant of n X n circulant matrix whose first row is the first n triangular numbers A000217(0), A000217(1), ... A000217(n-1).

Table of values

List of values