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A301280 as a simple table

na(n)
00
10
20
31
45
516
656
7198
8699
92490
108943
1132355
12117800
13431316
141587207
155867244
1621777203
1781127591
18303240041
191136914129
204274441613
2116111746161
2260873695892
23230495640009
24874525192278
253324270554675
2612658405644200
2748280298159610

[0,0,0,1,5,16,56,198,699,2490,8943,32355,117800,
 431316,1587207,5867244,21777203,81127591,
 303240041,1136914129,4274441613,16111746161,
 60873695892,230495640009,874525192278,
 3324270554675,12658405644200,48280298159610]