A369387 - cp's OEIS frontend

A369387 a(n) is the constant term in expansion of Product_{k=1..n} (x^(2k-1) + 1 + 1/x^(2k-1))^2.

n	a(n)
0	1
1	3
2	9
3	43
4	243
5	1539
6	10557
7	75595
8	558117
9	4218077
10	32466849
11	253624579
12	2005655781
13	16024596491
14	129159081787
15	1048931938309
16	8574963650419
17	70507361919587
18	582730070295737
19	4838280518142269
20	40336851095845719
21	337541054046113077
22	2834101218805540871

[1, 3, 9, 43, 243, 1539, 10557, 75595, 558117, 4218077, 32466849, 253624579, 2005655781, 16024596491, 129159081787, 1048931938309, 8574963650419, 70507361919587, 582730070295737, 4838280518142269, 40336851095845719, 337541054046113077, 2834101218805540871]

cp's OEIS Frontend

A369387 a(n) is the constant term in expansion of Product_{k=1..n} (x^(2k-1) + 1 + 1/x^(2k-1))^2.

Table of values

List of values

cp's OEIS Frontend

A369387 a(n) is the constant term in expansion of Product_{k=1..n} (x^(2*k-1) + 1 + 1/x^(2*k-1))^2.

Table of values

List of values

A369387 a(n) is the constant term in expansion of Product_{k=1..n} (x^(2k-1) + 1 + 1/x^(2k-1))^2.