A180420 - 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

A180420 as a simple table

n	a(n)
1	1
2	2
3	12
4	160
5	4592
6	276496
7	34174592
8	8570174016
9	4335215019520
10	4408454839564672
11	8992935435667848448
12	36753720073439398166016
13	300717909357395506394597376
14	4923649248081508021291300507648

[1,2,12,160,4592,276496,34174592,8570174016, 4335215019520,4408454839564672, 8992935435667848448,36753720073439398166016, 300717909357395506394597376, 4923649248081508021291300507648]