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A251287 as a simple table

na(n)
152
2219
3822
43390
512954
652474
7202882
8813336
93168621
1012623928
1149416048
12196129247
13770019542
143049031658
1511992662293
1647418860005
17186721692802
18737641381117
192906639008138
2011476362571548
2145241436664983

[52,219,822,3390,12954,52474,202882,813336,
 3168621,12623928,49416048,196129247,770019542,
 3049031658,11992662293,47418860005,186721692802,
 737641381117,2906639008138,11476362571548,
 45241436664983]