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A006013 as a simple table

na(n)
01
12
27
330
4143
5728
63876
721318
8120175
9690690
104032015
1123841480
12142498692
13859515920
145225264024
1531983672534
16196947587823
171219199353190
187583142491925
1947365474641870
20296983176369495
211868545312633440
2211793499763070480

[1,2,7,30,143,728,3876,21318,120175,690690,
 4032015,23841480,142498692,859515920,5225264024,
 31983672534,196947587823,1219199353190,
 7583142491925,47365474641870,296983176369495,
 1868545312633440,11793499763070480]