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A009699 as a simple table

na(n)
00
12
220
3518
427432
52405194
6312554428
756240197198
813369846932560
94056020122211730
101528702557462347620
11700644649971815625622
12383722595185095053746040
13247477546043660240025524954

[0,2,20,518,27432,2405194,312554428,56240197198,
 13369846932560,4056020122211730,
 1528702557462347620,700644649971815625622,
 383722595185095053746040,
 247477546043660240025524954]