A056872 - 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

A056872 as a simple table

n	a(n)
1	1
2	5
3	25
4	42
5	133
6	618
7	643
8	701
9	1962
10	8150
11	147458
12	168459
13	356038
14	415870
15	536685
16	637757
17	1093612
18	1207618
19	3368325
20	3470706
21	23400631
22	37621653

[1,5,25,42,133,618,643,701,1962,8150,147458, 168459,356038,415870,536685,637757,1093612, 1207618,3368325,3470706,23400631,37621653]