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A189491 as a simple table

na(n)
12
212
342
4136
5550
61892
77384
826816
9103288
10386928
111485566
125654000
1321736466
1483448592
15321767288
161241835856
174803432344
1818605438864
1972168550344
20280295950240
211089835505354
224242072071396
2316526909026016
2464446293812896

[2,12,42,136,550,1892,7384,26816,103288,386928,
 1485566,5654000,21736466,83448592,321767288,
 1241835856,4803432344,18605438864,72168550344,
 280295950240,1089835505354,4242072071396,
 16526909026016,64446293812896]