A304447 - cp's OEIS frontend

A304447 Coefficient of x^n in Product_{k>=1} ((1+x^k)/(1-x^k))^(2*n).

n	a(n)
0	1
1	4
2	40
3	448
4	5264
5	63624
6	783328
7	9770240
8	123040288
9	1561033348
10	19922193200
11	255472920256
12	3289122824000
13	42488488508808
14	550435283089088
15	7148519205631488
16	93038785849116736
17	1213215382135324680
18	15846906866928513736
19	207302985358274247104

[1, 4, 40, 448, 5264, 63624, 783328, 9770240, 123040288, 1561033348, 19922193200, 255472920256, 3289122824000, 42488488508808, 550435283089088, 7148519205631488, 93038785849116736, 1213215382135324680, 15846906866928513736, 207302985358274247104]

cp's OEIS Frontend

A304447 Coefficient of x^n in Product_{k>=1} ((1+x^k)/(1-x^k))^(2*n).

Table of values

List of values