A069021 - 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

A069021 as a simple table

n	a(n)
1	1
2	8
3	48
4	242
5	844
6	22020
7	217070
8	1092747
9	8870024
10	221167422
11	221167422
12	47255689915
13	82462576220
14	1043460553364
15	79180770078548
16	3215226335143218
17	23742453640900972

[1,8,48,242,844,22020,217070,1092747,8870024, 221167422,221167422,47255689915,82462576220, 1043460553364,79180770078548,3215226335143218, 23742453640900972]