A128319 - 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

A128319 as a simple table

n	a(n)
0	1
1	1
2	6
3	66
4	1034
5	20790
6	507600
7	14546196
8	478095264
9	17722127700
10	731393039376
11	33262113690576
12	1652889277811448
13	89115877932595848
14	5181554275409183904
15	323216011162774715904
16	21531610593372148573824

[1,1,6,66,1034,20790,507600,14546196,478095264, 17722127700,731393039376,33262113690576, 1652889277811448,89115877932595848, 5181554275409183904,323216011162774715904, 21531610593372148573824]

[1,1,6,66,1034,20790,507600,14546196,478095264,
 17722127700,731393039376,33262113690576,
 1652889277811448,89115877932595848,
 5181554275409183904,323216011162774715904,
 21531610593372148573824]