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A005948 as a simple table

na(n)
00
16
252
3411
43392
530070
6287802
72969267
832902560
9389989449
104924511300
1165995764461
12935412316380
1313978234748257
14219593721606826
153617245945896600
1662330776215811680
171121143456571006754
1821008889235589947362

[0,6,52,411,3392,30070,287802,2969267,32902560,
 389989449,4924511300,65995764461,935412316380,
 13978234748257,219593721606826,3617245945896600,
 62330776215811680,1121143456571006754,
 21008889235589947362]