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A056421 as a simple table

na(n)
14
26
316
445
572
6404
7456
82550
95144
1026880
1138568
12367170
13431776
143202964
158993712
1633857520
1763177816
18636456776
19803796696
206886253964
2117456593904
2279965511980
23139069427016
241466861335900

[4,6,16,45,72,404,456,2550,5144,26880,38568,
 367170,431776,3202964,8993712,33857520,63177816,
 636456776,803796696,6886253964,17456593904,
 79965511980,139069427016,1466861335900]