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A258625 as a simple table

na(n)
12
26
318
450
5105
6181
7316
8560
9969
101777
113699
128370
1318297
1436978
1573912
16155816
17335928
18697052
191360137
202539247
214757378
229452951
2320357207
2446362252
25107298090
26244529803
27538892048
281146917302
292392827002
304981802096

[2,6,18,50,105,181,316,560,969,1777,3699,8370,
 18297,36978,73912,155816,335928,697052,1360137,
 2539247,4757378,9452951,20357207,46362252,
 107298090,244529803,538892048,1146917302,
 2392827002,4981802096]