A258799 - cp's OEIS frontend

A258799 a(n) = [x^n] Product_{k=1..n} (1+x^k)^3 / x^(2*k).

n	a(n)
0	1
1	1
2	3
3	13
4	61
5	324
6	1800
7	10340
8	60969
9	366486
10	2237120
11	13829487
12	86394782
13	544547651
14	3458637273
15	22113504345
16	142212705879
17	919294844898
18	5969839457411
19	38927450022860
20	254776529381625
21	1673102335692514
22	11020847332241873
23	72798664086854460

[1, 1, 3, 13, 61, 324, 1800, 10340, 60969, 366486, 2237120, 13829487, 86394782, 544547651, 3458637273, 22113504345, 142212705879, 919294844898, 5969839457411, 38927450022860, 254776529381625, 1673102335692514, 11020847332241873, 72798664086854460]

cp's OEIS Frontend

A258799 a(n) = [x^n] Product_{k=1..n} (1+x^k)^3 / x^(2*k).

Table of values

List of values