A007196 - 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

A007196 as a simple table

n	a(n)
1	1
2	4
3	22
4	136
5	897
6	6168
7	43670
8	315956
9	2324479
10	17329828
11	130605478
12	993182984
13	7610051579
14	58689316888
15	455159096044

[1,4,22,136,897,6168,43670,315956,2324479, 17329828,130605478,993182984,7610051579, 58689316888,455159096044]