A001819 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A001819 as a simple table

n	a(n)
0	0
1	1
2	5
3	49
4	820
5	21076
6	773136
7	38402064
8	2483133696
9	202759531776
10	20407635072000
11	2482492033152000
12	359072203696128000
13	60912644957448192000
14	11977654199703478272000
15	2702572249389834608640000

[0,1,5,49,820,21076,773136,38402064,2483133696, 202759531776,20407635072000,2482492033152000, 359072203696128000,60912644957448192000, 11977654199703478272000,2702572249389834608640000]