A090597 - 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

A090597 as a simple table

n	a(n)
3	0
4	1
5	1
6	3
7	3
8	8
9	12
10	27
11	45
12	96
13	176
14	363
15	693
16	1408
17	2752
18	5547
19	10965
20	22016
21	43776
22	87723
23	174933
24	350208
25	699392
26	1399467
27	2796885
28	5595136
29	11186176
30	22375083
31	44741973
32	89489408

[0,1,1,3,3,8,12,27,45,96,176,363,693,1408,2752, 5547,10965,22016,43776,87723,174933,350208,699392, 1399467,2796885,5595136,11186176,22375083, 44741973,89489408]