A056329 - 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

A056329 as a simple table

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	9
7	76
8	542
9	3523
10	21393
11	123680
12	690550
13	3756151
14	20042589
15	105394296
16	548123982
17	2826435403
18	14479204833
19	73794961960
20	374603884910
21	1895632969351
22	9568915372269
23	48208452866816

[0,0,0,0,1,9,76,542,3523,21393,123680,690550, 3756151,20042589,105394296,548123982,2826435403, 14479204833,73794961960,374603884910, 1895632969351,9568915372269,48208452866816]