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A229638 as a simple table

na(n)
10
26
340
4122
5488
61608
75392
817368
955232
10172896
11535296
121641376
134992896
1415083648
1545297408
16135323008
17402405376
181191699968
193516119040
2010339711488
2130313351168
2288624646144
23258445856768
24751910639616
252182836600832

[0,6,40,122,488,1608,5392,17368,55232,172896,
 535296,1641376,4992896,15083648,45297408,
 135323008,402405376,1191699968,3516119040,
 10339711488,30313351168,88624646144,258445856768,
 751910639616,2182836600832]