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A000512 as a simple table

na(n)
10
20
31
41
52
67
716
851
9224
101165
117454
1256349
13481309
144548786
1546829325
16519812910
176177695783
1878190425826
191049510787100
2014886252250208
21222442888670708
223492326723315796
2357468395960854710
24989052970923320185
2517767732298980160822
26332572885090541084172
276475438355244504235759
28130954580036269713385884

[0,0,1,1,2,7,16,51,224,1165,7454,56349,481309,
 4548786,46829325,519812910,6177695783,78190425826,
 1049510787100,14886252250208,222442888670708,
 3492326723315796,57468395960854710,
 989052970923320185,17767732298980160822,
 332572885090541084172,6475438355244504235759,
 130954580036269713385884]