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A255612 as a simple table

na(n)
01
15
225
3100
4370
51251
64005
712150
835400
999365
10270353
11715025
121844650
134652075
1411494605
1527872056
1666428295
17155809600
18360079225
19820715820
201846583863
214104572975
229019869125
2319608423750
2442193733645
2589917531549
26189863358445
27397401303850

[1,5,25,100,370,1251,4005,12150,35400,99365,
 270353,715025,1844650,4652075,11494605,27872056,
 66428295,155809600,360079225,820715820,1846583863,
 4104572975,9019869125,19608423750,42193733645,
 89917531549,189863358445,397401303850]