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A061860 as a simple table

na(n)
01
12
24
311
428
5152
6726
75268
840438
9365944
103628810
1139974466
12479001612
136228256404
1487178339984
151307706805928
1620922789888016
17355688409760972
186402373705728018
19121645133931170028
202432902008232456692

[1,2,4,11,28,152,726,5268,40438,365944,3628810,
 39974466,479001612,6228256404,87178339984,
 1307706805928,20922789888016,355688409760972,
 6402373705728018,121645133931170028,
 2432902008232456692]