A147600 - OEIS

A147600 as a simple table

n	a(n)
0	1
1	0
2	3
3	0
4	8
5	0
6	21
7	0
8	55
9	0
10	144
11	0
12	377
13	0
14	987
15	0
16	2584
17	0
18	6765
19	0
20	17711
21	0
22	46368
23	0
24	121393
25	0
26	317811
27	0
28	832040
29	0
30	2178309
31	0
32	5702887
33	0
34	14930352
35	0
36	39088169
37	0
38	102334155
39	0
40	267914296
41	0
42	701408733
43	0
44	1836311903
45	0
46	4807526976
47	0

[1,0,3,0,8,0,21,0,55,0,144,0,377,0,987,0,2584,0, 6765,0,17711,0,46368,0,121393,0,317811,0,832040,0, 2178309,0,5702887,0,14930352,0,39088169,0, 102334155,0,267914296,0,701408733,0,1836311903,0, 4807526976,0]