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A021001 as a simple table

na(n)
02
19
240
3178
4792
53524
615680
769768
8310432
91381264
106145920
1127346208
12121676672
13541399104
142408949760
1510718597248
1647692288512
17212206348544
18944209971200
194201252581888
2018693430269952
2183176226243584
22370091765514240
231646719514544128

[2,9,40,178,792,3524,15680,69768,310432,1381264,
 6145920,27346208,121676672,541399104,2408949760,
 10718597248,47692288512,212206348544,944209971200,
 4201252581888,18693430269952,83176226243584,
 370091765514240,1646719514544128]