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A269405 as a simple table

na(n)
15
225
3120
4570
52670
612380
756890
8259445
91175355
105293671
1123718780
12105781845
13469798125
142078552055
159164402118
1640277785365
17176503698495
18771372344695
193362640467600
2014624384170213
2163463229049585
22274836205944615

[5,25,120,570,2670,12380,56890,259445,1175355,
 5293671,23718780,105781845,469798125,2078552055,
 9164402118,40277785365,176503698495,771372344695,
 3362640467600,14624384170213,63463229049585,
 274836205944615]