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A251504 as a simple table

na(n)
19635410
224294592462
361166220193608
4154063583681248806
5388048697552904231042
6977403456340809520106712
72461849509898181667047178526
86200820279850304698332473248358

[9635410,24294592462,61166220193608,
 154063583681248806,388048697552904231042,
 977403456340809520106712,
 2461849509898181667047178526,
 6200820279850304698332473248358]