A229055 - 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

A229055 as a simple table

n	a(n)
1	0
2	1
3	3
4	28
5	62
6	571
7	1555
8	2012
9	2529
10	2759
11	3018
12	4158
13	4740
14	6819
15	10564
16	11665
17	32858
18	139892
19	392129
20	707969
21	1049721
22	2081164
23	14990403
24	36112275
25	39552834
26	42710786
27	199618805

[0,1,3,28,62,571,1555,2012,2529,2759,3018,4158, 4740,6819,10564,11665,32858,139892,392129,707969, 1049721,2081164,14990403,36112275,39552834, 42710786,199618805]