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A153851 as a simple table

na(n)
11
21
36
457
5683
69474
7145815
82430393
943202448
10810629805
1115938815794
12326653743510
136949638584208
14153009877730525
153477623225388063
1681429702521625843
171961136442605508341
1848513571089988199157

[1,1,6,57,683,9474,145815,2430393,43202448,
 810629805,15938815794,326653743510,6949638584208,
 153009877730525,3477623225388063,
 81429702521625843,1961136442605508341,
 48513571089988199157]