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A193981 as a simple table

na(n)
10
20
30
42
523
6127
7468
81352
93310
107190
1114260
1226330
1345885
1476237
15121688
16187712
17281148
18410412
19585720
20819330
211125795
221522235
232028620
242668072
253467178
264456322
275670028
287147322
298932105
3011073545
3113626480
3216651840
3320217080

[0,0,0,2,23,127,468,1352,3310,7190,14260,26330,
 45885,76237,121688,187712,281148,410412,585720,
 819330,1125795,1522235,2028620,2668072,3467178,
 4456322,5670028,7147322,8932105,11073545,13626480,
 16651840,20217080]