A052653 - 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

A052653 as a simple table

n	a(n)
0	1
1	1
2	2
3	18
4	120
5	1320
6	15120
7	216720
8	3427200
9	62052480
10	1237420800
11	27263174400
12	653837184000
13	17005993804800
14	476080648243200
15	14283727121664000
16	457058345103360000
17	15540339420942336000

[1,1,2,18,120,1320,15120,216720,3427200,62052480, 1237420800,27263174400,653837184000, 17005993804800,476080648243200,14283727121664000, 457058345103360000,15540339420942336000]