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A113947 as a simple table

na(n)
11
22
33
48
516
664
7264
81580
910648
1084320
11750380
127455312
1381566928
14974988768
1512636692720
16176505029160
172642791002368
1842224138928712
19716984262871596
2012893605560786944

[1,2,3,8,16,64,264,1580,10648,84320,750380,
 7455312,81566928,974988768,12636692720,
 176505029160,2642791002368,42224138928712,
 716984262871596,12893605560786944]