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A187421 as a simple table

na(n)
1609
26512
346764
4602024
55254072
656472058
7533853394
85585054046
954998694426
10562340568708
115598043072500
1256738877828678
13568753193822092
145743694780294918
1557708886492197048
16581740972471740850

[609,6512,46764,602024,5254072,56472058,533853394,
 5585054046,54998694426,562340568708,5598043072500,
 56738877828678,568753193822092,5743694780294918,
 57708886492197048,581740972471740850]