A002226 - 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

A002226 as a simple table

n	a(n)
1	151
2	431
3	6581
4	67651
5	241981
6	2081921
7	3395921
8	116900011
9	650086271
10	858613901
11	11736494711
12	50888057851
13	303855349271
14	2459339487751
15	3167880361091

[151,431,6581,67651,241981,2081921,3395921, 116900011,650086271,858613901,11736494711, 50888057851,303855349271,2459339487751, 3167880361091]