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A018913 as a simple table

na(n)
00
11
29
380
4711
56319
656160
7499121
84435929
939424240
10350382231
113114015839
1227675760320
13245967827041
142186034683049
1519428344320400
16172669064200551
171534593233484559
1813638670037160480
19121213437100959761

[0,1,9,80,711,6319,56160,499121,4435929,39424240,
 350382231,3114015839,27675760320,245967827041,
 2186034683049,19428344320400,172669064200551,
 1534593233484559,13638670037160480,
 121213437100959761]