A286696 - OEIS

A286696 as a simple table

n	a(n)
0	1
1	2
2	0
3	12
4	1
5	56
6	1
7	240
8	1
9	996
10	3
11	4044
12	1
13	16256
14	31
15	65312
16	7
17	261640
18	7
19	1047560
20	7
21	4192640
22	68
23	16773657
24	0
25	67100929
26	1568
27	268421379
28	640
29	1073709319
30	0
31	4294905408
32	0
33	17179763769
34	0
35	68719247369
36	14336
37	274877382656
38	78593
39	1099510710272
40	25081

[1,2,0,12,1,56,1,240,1,996,3,4044,1,16256,31, 65312,7,261640,7,1047560,7,4192640,68,16773657,0, 67100929,1568,268421379,640,1073709319,0, 4294905408,0,17179763769,0,68719247369,14336, 274877382656,78593,1099510710272,25081]

[1,2,0,12,1,56,1,240,1,996,3,4044,1,16256,31,
 65312,7,261640,7,1047560,7,4192640,68,16773657,0,
 67100929,1568,268421379,640,1073709319,0,
 4294905408,0,17179763769,0,68719247369,14336,
 274877382656,78593,1099510710272,25081]