A128081 - cp's OEIS frontend

A128081 Central coefficients of q in the q-analog of the odd double factorials: a(n) = [q^(n(n-1)/2)] Product_{j=1..n} (1-q^(2j-1))/(1-q).

n	a(n)
0	1
1	1
2	1
3	3
4	15
5	97
6	815
7	8447
8	104099
9	1487477
10	24188525
11	441170745
12	8920418105
13	198066401671
14	4791181863221
15	125421804399845
16	3532750812110925
17	106538929613501939
18	3425126166609830467
19	116938867144129019137
20	4225543021235970185429
21	161113285522023566327031

[1, 1, 1, 3, 15, 97, 815, 8447, 104099, 1487477, 24188525, 441170745, 8920418105, 198066401671, 4791181863221, 125421804399845, 3532750812110925, 106538929613501939, 3425126166609830467, 116938867144129019137, 4225543021235970185429, 161113285522023566327031]

cp's OEIS Frontend

A128081 Central coefficients of q in the q-analog of the odd double factorials: a(n) = [q^(n(n-1)/2)] Product_{j=1..n} (1-q^(2j-1))/(1-q).

Table of values

List of values