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A188982 as a simple table

na(n)
00
12
212
346
4120
5122
6828
76554
828560
986158
10145668
11246046
123369960
1317021162
1458317492
15128629846
1613651680
171590277918
189719139348
1937641223154
2099498527400
21107655263398
22647549275812
235284814079046
2423290743888720
2571041880304722
26123471611274972
27182714776311554
282701419604443960
2913833225534613558
3047880898349909868

[0,2,12,46,120,122,828,6554,28560,86158,145668,
 246046,3369960,17021162,58317492,128629846,
 13651680,1590277918,9719139348,37641223154,
 99498527400,107655263398,647549275812,
 5284814079046,23290743888720,71041880304722,
 123471611274972,182714776311554,2701419604443960,
 13833225534613558,47880898349909868]