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A007226 as a simple table

na(n)
02
13
210
342
4198
51001
65304
729070
8163438
9937365
105462730
1132256120
12192565800
131160346492
147048030544
1543108428198
16265276342782
171641229898525
1810202773534590
1963698396932170
20399223286267190
212510857763851185
2215842014607109600

[2,3,10,42,198,1001,5304,29070,163438,937365,
 5462730,32256120,192565800,1160346492,7048030544,
 43108428198,265276342782,1641229898525,
 10202773534590,63698396932170,399223286267190,
 2510857763851185,15842014607109600]