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A007256 as a simple table

na(n)
-11
00
115
2-32
387
4-192
5343
6-672
71290
8-2176
93705
10-6336
1110214
12-16320
1325905
14-39936
1561227
16-92928
17138160
18-204576
19300756
20-435328
21626727
22-897408
231271205
24-1790592
252508783
26-3487424
274824825
28-6641664
299083400
30-12371904
3116778784
32-22630912
3330407112
34-40703040
3554238342
36-72018624

[1,0,15,-32,87,-192,343,-672,1290,-2176,3705,
 -6336,10214,-16320,25905,-39936,61227,-92928,
 138160,-204576,300756,-435328,626727,-897408,
 1271205,-1790592,2508783,-3487424,4824825,
 -6641664,9083400,-12371904,16778784,-22630912,
 30407112,-40703040,54238342,-72018624]