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A277505 as a simple table

na(n)
00
11
24
321
4148
51365
615966
7229411
83932440
978438681
101784386810
1145565679511
121289796524820
1340065439945141
141354630932486118
1549512390012682395
161945119744809765296
1781728227537432878513
183657019655412488345202
19173610723750748520091679

[0,1,4,21,148,1365,15966,229411,3932440,78438681,
 1784386810,45565679511,1289796524820,
 40065439945141,1354630932486118,49512390012682395,
 1945119744809765296,81728227537432878513,
 3657019655412488345202,173610723750748520091679]