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A309451 as a simple table

na(n)
00
15
226
375
41104
53505
620312
720312
84961570
928020774
10229788809
11512264058
122489590801
1371696026806
1471696026806
1571696026806
1619061942066578
17218459525484184
18451090039471391

[0,5,26,75,1104,3505,20312,20312,4961570,28020774,
 229788809,512264058,2489590801,71696026806,
 71696026806,71696026806,19061942066578,
 218459525484184,451090039471391]