A121272 - 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

A121272 as a simple table

n	a(n)
1	0
2	0
3	0
4	0
5	5
6	45
7	438
8	6849
9	191483
10	9732967
11	903753099
12	154108310917
13	48542114686488
14	28401423719121589
15	31021002160355165644
16	63530415842308265098260
17	244912778438520759443242406

[0,0,0,0,5,45,438,6849,191483,9732967,903753099, 154108310917,48542114686488,28401423719121589, 31021002160355165644,63530415842308265098260, 244912778438520759443242406]