A273331 - 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

A273331 as a simple table

n	a(n)
0	1
1	5
2	17
3	69
4	281
5	1129
6	4521
7	18089
8	72361
9	289449
10	1157801
11	4631209
12	18524841
13	74099369
14	296397481
15	1185589929

[1,5,17,69,281,1129,4521,18089,72361,289449, 1157801,4631209,18524841,74099369,296397481, 1185589929]