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A218334 as a simple table

na(n)
21
34
438
53
6728
740
826704
9730
1015
111866256
1220608
13420
14251548592
15961324
1612460
17105
1866296291072
1979643424
20484624
215040
2234496488594816
2312495365424
2427712860
25220500
26945
2735641657548953344
283844702446464
292619965040
3011297440
3169300
3273354596206766622208
332341246104706784
34458476648344
35775542460
364192650
3710395

[1,4,38,3,728,40,26704,730,15,1866256,20608,420,
 251548592,961324,12460,105,66296291072,79643424,
 484624,5040,34496488594816,12495365424,27712860,
 220500,945,35641657548953344,3844702446464,
 2619965040,11297440,69300,73354596206766622208,
 2341246104706784,458476648344,775542460,4192650,
 10395]