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A005755 as a simple table

na(n)
10
20
30
41
54
616
764
8252
91018
104182
1117510
1274510
13322034
141410362
156251114
1627998532
17126583634
18577079333
192650573354
2012256481666
2157021299394
22266754944481
231254245360430
245924659521632
2528105641930102
26133853504339029
27639801068848128

[0,0,0,1,4,16,64,252,1018,4182,17510,74510,322034,
 1410362,6251114,27998532,126583634,577079333,
 2650573354,12256481666,57021299394,266754944481,
 1254245360430,5924659521632,28105641930102,
 133853504339029,639801068848128]