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A108307 as a simple table

na(n)
01
11
22
35
415
551
6191
7772
83320
915032
1071084
11348889
121768483
139220655
1449286863
15269346822
161501400222
178519796094
1849133373040
19287544553912
201705548000296
2110241669069576
2262201517142632
23381749896129920
242365758616886432
2514793705539872672

[1,1,2,5,15,51,191,772,3320,15032,71084,348889,
 1768483,9220655,49286863,269346822,1501400222,
 8519796094,49133373040,287544553912,1705548000296,
 10241669069576,62201517142632,381749896129920,
 2365758616886432,14793705539872672]