A139164 - 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

A139164 as a simple table

n	a(n)
2	2
3	21
4	841
5	6652801
6	1037836801
7	59281238016001
8	20274183401472001
9	4308669456480829440001
10	1473626998956616992423936000001
11	1370473109029653802954260480000001

[2,21,841,6652801,1037836801,59281238016001, 20274183401472001,4308669456480829440001, 1473626998956616992423936000001, 1370473109029653802954260480000001]