A064846 - 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

A064846 as a simple table

n	a(n)
1	1
2	1
3	1
4	3
5	18
6	720
7	1119600
8	2726809311600
9	16145931379144511904735600
10	566327308576692897981544319968226968281922500063600

[1,1,1,3,18,720,1119600,2726809311600, 16145931379144511904735600, 56632730857669289798154431996822696828192250006360\ 0]