A074631 - 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

A074631 as a simple table

n	a(n)
1	9
2	44
3	168
4	587
5	1940
6	6192
7	19285
8	59010
9	178122
10	531923
11	1574706
12	4628338
13	13521477
14	39299115
15	113712434
16	327752962
17	941457955
18	2696114317
19	7700146599
20	21938239766

[9,44,168,587,1940,6192,19285,59010,178122,531923, 1574706,4628338,13521477,39299115,113712434, 327752962,941457955,2696114317,7700146599, 21938239766]