A369386 - cp's OEIS frontend

A369386 a(n) is the constant term in expansion of Product_{k=1..n} (x^(2k-1) + 1/x^(2k-1))^2.

n	a(n)
0	1
1	2
2	4
3	8
4	18
5	48
6	138
7	428
8	1392
9	4652
10	15884
11	55124
12	193724
13	688008
14	2465134
15	8899700
16	32342236
17	118215780
18	434314138
19	1602935104
20	5940303754
21	22095769648
22	82464791420
23	308715131744
24	1158949678600
25	4362040367048
26	16456820491806
27	62223707844096

[1, 2, 4, 8, 18, 48, 138, 428, 1392, 4652, 15884, 55124, 193724, 688008, 2465134, 8899700, 32342236, 118215780, 434314138, 1602935104, 5940303754, 22095769648, 82464791420, 308715131744, 1158949678600, 4362040367048, 16456820491806, 62223707844096]

cp's OEIS Frontend

A369386 a(n) is the constant term in expansion of Product_{k=1..n} (x^(2k-1) + 1/x^(2k-1))^2.

Table of values

List of values

cp's OEIS Frontend

A369386 a(n) is the constant term in expansion of Product_{k=1..n} (x^(2*k-1) + 1/x^(2*k-1))^2.

Table of values

List of values

A369386 a(n) is the constant term in expansion of Product_{k=1..n} (x^(2k-1) + 1/x^(2k-1))^2.