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A307733 as a simple table

na(n)
01
11
24
314
454
5220
6934
74090
818344
983850
10389214
111829736
128693962
1341685714
14201442188
15980091814
164797070022
1723603701828
18116688837886
19579312087802
202887020896016
2114437318756818
2272424982972862
23364366674463824
241837954750285458

[1,1,4,14,54,220,934,4090,18344,83850,389214,
 1829736,8693962,41685714,201442188,980091814,
 4797070022,23603701828,116688837886,579312087802,
 2887020896016,14437318756818,72424982972862,
 364366674463824,1837954750285458]