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A215221 as a simple table

na(n)
10
20
31
41
51
65
711
828
969
10164
11437
121104
132887
147778
1520861
1655610
17148857
18408694
191112103
203059571
218519916
2223586160
2365766961
24183122954
25508287720
261423807763
274019399991
2811359914488
2932294035715
3091866217942
31258134484981
32732226048291

[0,0,1,1,1,5,11,28,69,164,437,1104,2887,7778,
 20861,55610,148857,408694,1112103,3059571,8519916,
 23586160,65766961,183122954,508287720,1423807763,
 4019399991,11359914488,32294035715,91866217942,
 258134484981,732226048291]