A124995 - cp's OEIS frontend

A124995 a(n) is the constant term in expansion of Product_{ k = 1..n } (x^k + 1/x^k)^3.

n	a(n)
0	1
1	0
2	0
3	62
4	332
5	0
6	0
7	80006
8	531524
9	0
10	0
11	173607568
12	1226700784
13	0
14	0
15	455805857978
16	3321800235936
17	0
18	0
19	1325490660318216
20	9841000101286172
21	0
22	0
23	4108826483323392880
24	30886378286619335592
25	0
26	0
27	13306426381421174346512
28	100916492010297213463566

[1, 0, 0, 62, 332, 0, 0, 80006, 531524, 0, 0, 173607568, 1226700784, 0, 0, 455805857978, 3321800235936, 0, 0, 1325490660318216, 9841000101286172, 0, 0, 4108826483323392880, 30886378286619335592, 0, 0, 13306426381421174346512, 100916492010297213463566]

cp's OEIS Frontend

A124995 a(n) is the constant term in expansion of Product_{ k = 1..n } (x^k + 1/x^k)^3.

Table of values

List of values