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A251344 as a simple table

na(n)
151
2309
31899
411709
572243
6445797
72751003
816976493
9104762403
10646491861
113989520459
1224619449501
13151927356051
14937548239301
155785638109947
1635703345104973
17220326406088067
181359640814523957
198390383964148267

[51,309,1899,11709,72243,445797,2751003,16976493,
 104762403,646491861,3989520459,24619449501,
 151927356051,937548239301,5785638109947,
 35703345104973,220326406088067,1359640814523957,
 8390383964148267]