A000405 - 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

A000405 as a simple table

n	a(n)
0	1
1	1
2	6
3	51
4	561
5	7556
6	120196
7	2201856
8	45592666
9	1051951026
10	26740775306
11	742069051906
12	22310563733864
13	722108667742546
14	25024187820786357
15	924161461265888370
16	36223781285638309482
17	1501552062016443881514

[1,1,6,51,561,7556,120196,2201856,45592666, 1051951026,26740775306,742069051906, 22310563733864,722108667742546,25024187820786357, 924161461265888370,36223781285638309482, 1501552062016443881514]