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A180787 as a simple table

na(n)
10
21
35
464
5400
61914
77589
824902
973134
10188315
11455127
12996083
132098908
144080930
157790731
1613869018
1724527424
1840768032
1967955336
20106952861
21169909977
22255608028
23390623704
24566247614
25837326375
261175991196
271690928973

[0,1,5,64,400,1914,7589,24902,73134,188315,455127,
 996083,2098908,4080930,7790731,13869018,24527424,
 40768032,67955336,106952861,169909977,255608028,
 390623704,566247614,837326375,1175991196,
 1690928973]