A369389 - cp's OEIS frontend

A369389 a(n) is the constant term in expansion of Product_{k=1..n} (x^(k^2) + 1 + 1/x^(k^2))^2.

n	a(n)
0	1
1	3
2	9
3	35
4	141
5	745
6	3955
7	23985
8	155527
9	1060941
10	7393765
11	53041015
12	387815175
13	2882682967
14	21715452927
15	165583974835
16	1275674593889
17	9918184576835
18	77738274996385
19	613753581566079
20	4877383708962749
21	38989308129231703
22	313354624116918229
23	2530796548734844153

[1, 3, 9, 35, 141, 745, 3955, 23985, 155527, 1060941, 7393765, 53041015, 387815175, 2882682967, 21715452927, 165583974835, 1275674593889, 9918184576835, 77738274996385, 613753581566079, 4877383708962749, 38989308129231703, 313354624116918229, 2530796548734844153]

cp's OEIS Frontend

A369389 a(n) is the constant term in expansion of Product_{k=1..n} (x^(k^2) + 1 + 1/x^(k^2))^2.

Table of values

List of values