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A131570 as a simple table

na(n)
11
212
36
43
534
617
71718
8859
9859860
10429930
11214965
12214965214966
13107482607483
14107482607483107482607484
1553741303741553741303742
1626870651870776870651871
172687065187077687065187126870651870776870651872

[1,12,6,3,34,17,1718,859,859860,429930,214965,
 214965214966,107482607483,
 107482607483107482607484,53741303741553741303742,
 26870651870776870651871,
 2687065187077687065187126870651870776870651872]