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A001091 as a simple table

na(n)
01
14
231
3244
41921
515124
6119071
7937444
87380481
958106404
10457470751
113601659604
1228355806081
13223244789044
141757602506271
1513837575261124
16108942999582721
17857706421400644
186752708371622431
1953163960551578804

[1,4,31,244,1921,15124,119071,937444,7380481,
 58106404,457470751,3601659604,28355806081,
 223244789044,1757602506271,13837575261124,
 108942999582721,857706421400644,6752708371622431,
 53163960551578804]