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A129815 as a simple table

na(n)
10
20
31
42
56
622
7102
8506
92952
1018502
11131112
12991226
138271792
1473176262
15703077552
167121578106
1777437418112
18883521487942
1910726837356672
20136104948161786
211825110309733632

[0,0,1,2,6,22,102,506,2952,18502,131112,991226,
 8271792,73176262,703077552,7121578106,77437418112,
 883521487942,10726837356672,136104948161786,
 1825110309733632]