A270906 - 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

A270906 as a simple table

n	a(n)
0	1
1	5
2	24
3	84
4	328
5	1196
6	4344
7	17004
8	66964
9	267448
10	1067972
11	4262388
12	17056668
13	68267088
14	273166344
15	1092841752

[1,5,24,84,328,1196,4344,17004,66964,267448, 1067972,4262388,17056668,68267088,273166344, 1092841752]