A110771 - 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

A110771 as a simple table

n	a(n)
1	1
2	4
3	17
4	82
5	453
6	2855
7	20279
8	159972
9	1383544
10	12987671
11	131301747
12	1420538383
13	16358806638
14	199606632428
15	2570446661320
16	34814885202341
17	494470158654963
18	7344794248474716
19	113829232686474480

[1,4,17,82,453,2855,20279,159972,1383544,12987671, 131301747,1420538383,16358806638,199606632428, 2570446661320,34814885202341,494470158654963, 7344794248474716,113829232686474480]