A204857 - cp's OEIS frontend

A204857 G.f.: Sum_{n>=0} n!x^(n(n+1)/2) / Product_{k=1..n} (1 - (n-k+1)*x^k).

n	a(n)
0	1
1	1
2	1
3	3
4	5
5	11
6	27
7	61
8	151
9	375
10	1001
11	2699
12	7635
13	22069
14	65695
15	199671
16	620417
17	1966715
18	6367323
19	21059149
20	71216311
21	246322503
22	871268465
23	3148964147
24	11613253707
25	43625643373
26	166606282471
27	645633978279
28	2534590357457
29	10066575332603

[1, 1, 1, 3, 5, 11, 27, 61, 151, 375, 1001, 2699, 7635, 22069, 65695, 199671, 620417, 1966715, 6367323, 21059149, 71216311, 246322503, 871268465, 3148964147, 11613253707, 43625643373, 166606282471, 645633978279, 2534590357457, 10066575332603]

cp's OEIS Frontend

A204857 G.f.: Sum_{n>=0} n!x^(n(n+1)/2) / Product_{k=1..n} (1 - (n-k+1)*x^k).

Table of values

List of values

cp's OEIS Frontend

A204857 G.f.: Sum_{n>=0} n!*x^(n*(n+1)/2) / Product_{k=1..n} (1 - (n-k+1)*x^k).

Table of values

List of values

A204857 G.f.: Sum_{n>=0} n!x^(n(n+1)/2) / Product_{k=1..n} (1 - (n-k+1)*x^k).