A003428 - 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

A003428 as a simple table

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	2
8	3
9	5
10	12
11	22
12	47
13	94
14	201
15	417
16	907
17	1948
18	4289
19	9440
20	21063
21	47124
22	106377
23	240980
24	549272
25	1256609
26	2888057
27	6660347
28	15416623
29	35794121
30	83362301

[0,0,0,0,0,0,2,3,5,12,22,47,94,201,417,907,1948, 4289,9440,21063,47124,106377,240980,549272, 1256609,2888057,6660347,15416623,35794121, 83362301]