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A002754 as a simple table

na(n)
00
10
24
344
4408
53688
633212
7298932
82690416
924213776
10217924020
111961316220
1217651846024
13158866614264
141429799528428
1512868195755908
16115813761803232
171042323856229152
189380914706062436
1984428232354561996
20759854091191058040

[0,0,4,44,408,3688,33212,298932,2690416,24213776,
 217924020,1961316220,17651846024,158866614264,
 1429799528428,12868195755908,115813761803232,
 1042323856229152,9380914706062436,
 84428232354561996,759854091191058040]