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A256216 as a simple table

na(n)
10
20
30
40
50
61
71
84
97
1018
1131
1270
13126
14261
15484
16960
171800
183515
196643
2012852
2124458
2247151
2390157
24173744
25333498
26643230
271238671
282392650
294620006
308939676
3117302033
3233538048
3365042526
34126289800
35245361172

[0,0,0,0,0,1,1,4,7,18,31,70,126,261,484,960,1800,
 3515,6643,12852,24458,47151,90157,173744,333498,
 643230,1238671,2392650,4620006,8939676,17302033,
 33538048,65042526,126289800,245361172]