A258789 - cp's OEIS frontend

A258789 a(n) = [x^n] Product_{k=1..n} 1/(x^(2k)(1-x^k)).

n	a(n)
0	1
1	1
2	5
3	27
4	169
5	1115
6	7760
7	55748
8	411498
9	3101490
10	23785645
11	185064559
12	1457664666
13	11602828475
14	93205739436
15	754751603157
16	6155229065861
17	50515624923790
18	416930705579538
19	3458726257239312
20	28825340825747729
21	241245120218823892
22	2026803168946440648

[1, 1, 5, 27, 169, 1115, 7760, 55748, 411498, 3101490, 23785645, 185064559, 1457664666, 11602828475, 93205739436, 754751603157, 6155229065861, 50515624923790, 416930705579538, 3458726257239312, 28825340825747729, 241245120218823892, 2026803168946440648]

cp's OEIS Frontend

A258789 a(n) = [x^n] Product_{k=1..n} 1/(x^(2k)(1-x^k)).

Table of values

List of values

cp's OEIS Frontend

A258789 a(n) = [x^n] Product_{k=1..n} 1/(x^(2*k)*(1-x^k)).

Table of values

List of values

A258789 a(n) = [x^n] Product_{k=1..n} 1/(x^(2k)(1-x^k)).