A127691 - cp's OEIS frontend

A127691 a(n) = (2n+1)^n-(2n-1)^n-(2*n)^n.

n	a(n)
0	-1
1	0
2	0
3	2
4	64
5	2002
6	69264
7	2697354
8	117899520
9	5740530914
10	308814720400
11	18213955960378
12	1169672907313728
13	81286160430474066
14	6080123714344570128
15	487166244246501489002
16	41636260100744439399424
17	3781449867356996500139458
18	363724112817207189865471248

[-1, 0, 0, 2, 64, 2002, 69264, 2697354, 117899520, 5740530914, 308814720400, 18213955960378, 1169672907313728, 81286160430474066, 6080123714344570128, 487166244246501489002, 41636260100744439399424, 3781449867356996500139458, 363724112817207189865471248]

cp's OEIS Frontend

A127691 a(n) = (2n+1)^n-(2n-1)^n-(2*n)^n.

Table of values

List of values

cp's OEIS Frontend

A127691 a(n) = (2*n+1)^n-(2*n-1)^n-(2*n)^n.

Table of values

List of values

A127691 a(n) = (2n+1)^n-(2n-1)^n-(2*n)^n.