A049166 - 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

A049166 as a simple table

n	a(n)
0	1
1	1
2	3
3	11
4	45
5	195
6	885
7	4153
8	19983
9	98055
10	488805
11	2468545
12	12602743
13	64937493
14	337264163
15	1763752075
16	9279601413
17	49084160037
18	260867197263
19	1392352081031
20	7460146494529
21	40110432099247
22	216343171411657

[1,1,3,11,45,195,885,4153,19983,98055,488805, 2468545,12602743,64937493,337264163,1763752075, 9279601413,49084160037,260867197263,1392352081031, 7460146494529,40110432099247,216343171411657]