A206228 - cp's OEIS frontend

A206228 a(n) = [x^n] Product_{k=1..n} 1/(1 - x^k)^(n-k+1).

n	a(n)
0	1
1	1
2	4
3	17
4	80
5	384
6	1887
7	9385
8	47139
9	238488
10	1213588
11	6204547
12	31844710
13	163978344
14	846741721
15	4382945317
16	22735196277
17	118151632006
18	615032941924
19	3206257881171
20	16736910271178
21	87472908459696
22	457662760258109
23	2396899780970552
24	12564645719730297

[1, 1, 4, 17, 80, 384, 1887, 9385, 47139, 238488, 1213588, 6204547, 31844710, 163978344, 846741721, 4382945317, 22735196277, 118151632006, 615032941924, 3206257881171, 16736910271178, 87472908459696, 457662760258109, 2396899780970552, 12564645719730297]

cp's OEIS Frontend

A206228 a(n) = [x^n] Product_{k=1..n} 1/(1 - x^k)^(n-k+1).

Table of values

List of values