A305655 - cp's OEIS frontend

A305655 a(n) = [x^n] exp(Sum_{k>=1} (-1)^(k+1)x^k(1 + x^k)/(k*(1 - x^k)^n)).

n	a(n)
0	1
1	1
2	3
3	13
4	54
5	290
6	1674
7	10857
8	76398
9	580230
10	4706734
11	40598349
12	370694845
13	3569027696
14	36100349833
15	382360758863
16	4228730647420
17	48716663849192
18	583403253712747
19	7248883337962522
20	93291181556742684
21	1241632098163126324
22	17064777292709034968
23	241874821482784132204

[1, 1, 3, 13, 54, 290, 1674, 10857, 76398, 580230, 4706734, 40598349, 370694845, 3569027696, 36100349833, 382360758863, 4228730647420, 48716663849192, 583403253712747, 7248883337962522, 93291181556742684, 1241632098163126324, 17064777292709034968, 241874821482784132204]

cp's OEIS Frontend

A305655 a(n) = [x^n] exp(Sum_{k>=1} (-1)^(k+1)x^k(1 + x^k)/(k*(1 - x^k)^n)).

Table of values

List of values

cp's OEIS Frontend

A305655 a(n) = [x^n] exp(Sum_{k>=1} (-1)^(k+1)*x^k*(1 + x^k)/(k*(1 - x^k)^n)).

Table of values

List of values

A305655 a(n) = [x^n] exp(Sum_{k>=1} (-1)^(k+1)x^k(1 + x^k)/(k*(1 - x^k)^n)).