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A219672 as a simple table

na(n)
00
11
25
320
487
5405
61924
79225
844625
9217528
101066725
115256087
1226001000
13129053365
14642376709
153205403100
1616029187391
1780309053285
18403040543420
192025751379997
2010195547237235
2151376594943136
22259180112907875
231308811957775785
246615383878581072

[0,1,5,20,87,405,1924,9225,44625,217528,1066725,
 5256087,26001000,129053365,642376709,3205403100,
 16029187391,80309053285,403040543420,
 2025751379997,10195547237235,51376594943136,
 259180112907875,1308811957775785,6615383878581072]