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A060931 as a simple table

na(n)
01
115
2110
3545
42120
57043
620965
757560
8148545
9365045
10862224
111970905
124382820
139520315
1420265665
1542385132
1687284120
17177293730
18355738710
19705980760
201387213926
212701362950
225217448800
2310001654350

[1,15,110,545,2120,7043,20965,57560,148545,365045,
 862224,1970905,4382820,9520315,20265665,42385132,
 87284120,177293730,355738710,705980760,1387213926,
 2701362950,5217448800,10001654350]