A269270 - 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

A269270 as a simple table

n	a(n)
1	4
2	108
3	1620
4	20412
5	236196
6	2598156
7	27634932
8	286978140
9	2927177028
10	29443957164
11	292889889684
12	2887057484028
13	28242953648100
14	274521509459532
15	2653707924775476
16	25530500379736476
17	244598664928443012

[4,108,1620,20412,236196,2598156,27634932, 286978140,2927177028,29443957164,292889889684, 2887057484028,28242953648100,274521509459532, 2653707924775476,25530500379736476, 244598664928443012]