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A307724 as a simple table

na(n)
00
11
21
33
412
564
6402
72999
825100
9236278
102444779
1127725926
12340761474
134522224643
1464378645709
15979609661544
1615862570817855
17272466359964053
184948142926019039
1994748748685737418
201907956061833749740
2140310880538563569017
22891655630401500129652
2320608302703021633063682

[0,1,1,3,12,64,402,2999,25100,236278,2444779,
 27725926,340761474,4522224643,64378645709,
 979609661544,15862570817855,272466359964053,
 4948142926019039,94748748685737418,
 1907956061833749740,40310880538563569017,
 891655630401500129652,20608302703021633063682]