A320652 - cp's OEIS frontend

A320652 Expansion of 1/(2 - Product_{k>=1} 1/(1 - k*x^k)).

n	a(n)
0	1
1	1
2	4
3	13
4	45
5	147
6	497
7	1643
8	5490
9	18252
10	60812
11	202364
12	673915
13	2243295
14	7468973
15	24865272
16	82783967
17	275605513
18	917563193
19	3054785032
20	10170143277
21	33858882922
22	112724577088
23	375287739083
24	1249425198725
25	4159643200494
26	13848474406054
27	46104972636634
28	153494780854254

[1, 1, 4, 13, 45, 147, 497, 1643, 5490, 18252, 60812, 202364, 673915, 2243295, 7468973, 24865272, 82783967, 275605513, 917563193, 3054785032, 10170143277, 33858882922, 112724577088, 375287739083, 1249425198725, 4159643200494, 13848474406054, 46104972636634, 153494780854254]

cp's OEIS Frontend

A320652 Expansion of 1/(2 - Product_{k>=1} 1/(1 - k*x^k)).

Table of values

List of values