A032259 - 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

A032259 as a simple table

n	a(n)
1	2
2	1
3	2
4	4
5	14
6	50
7	194
8	750
9	2934
10	11557
11	46010
12	184784
13	748678
14	3056308
15	12562908
16	51952261
17	216011544
18	902512979
19	3787287378
20	15955748048
21	67462625834
22	286172617162
23	1217561851258
24	5194521586232

[2,1,2,4,14,50,194,750,2934,11557,46010,184784, 748678,3056308,12562908,51952261,216011544, 902512979,3787287378,15955748048,67462625834, 286172617162,1217561851258,5194521586232]