A268656 - OEIS

A268656 as a simple table

n	a(n)
-2	1
-1	0
0	0
1	0
2	2
3	0
4	6
5	6
6	11
7	16
8	38
9	58
10	103
11	152
12	267
13	486
14	861
15	1392
16	2276
17	3812
18	6562
19	11224
20	18906
21	31446
22	52392
23	87776
24	147423
25	246698
26	411358
27	685988
28	1145964
29	1913208
30	3184968
31	5288788
32	8779115
33	14587396
34	24250424
35	40280516
36	66808605
37	110689870
38	183321646
39	303558816
40	502460050
41	831201108
42	1374306023
43	2271447536
44	3753011555
45	6198348494
46	10232046899
47	16883378468
48	27848975062
49	45923355280

[1,0,0,0,2,0,6,6,11,16,38,58,103,152,267,486,861, 1392,2276,3812,6562,11224,18906,31446,52392,87776, 147423,246698,411358,685988,1145964,1913208, 3184968,5288788,8779115,14587396,24250424, 40280516,66808605,110689870,183321646,303558816, 502460050,831201108,1374306023,2271447536, 3753011555,6198348494,10232046899,16883378468, 27848975062,45923355280]