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A135218 as a simple table

na(n)
01
11
21
325
425
5745
63145
740945
8353425
94200625
1049949425
11666656425
129492440425
13145513569625
142378864325625
1541355134658625
16761412592638625
1714800232282598625
18302834714220150625

[1,1,1,25,25,745,3145,40945,353425,4200625,
 49949425,666656425,9492440425,145513569625,
 2378864325625,41355134658625,761412592638625,
 14800232282598625,302834714220150625]