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A192507 as a simple table

na(n)
10
20
31
42
57
614
752
8104
9333
10870
112571
124590
1320440
1456736
15133782
16327558
171265391
182612694
1910188836
2020769420
2176562106

[0,0,1,2,7,14,52,104,333,870,2571,4590,20440,
 56736,133782,327558,1265391,2612694,10188836,
 20769420,76562106]