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A272820 as a simple table

na(n)
11
22
36
428
5150
6848
74988
830320
9189030
101201792
117761296
1250774280
13335776204
142241022944
1515075584864
16102113820256
17695842808070
184767068036992
1932813466593552
20226829615262744
211574027068685944
2210960566883613504
2376564394477117688
24536383955787886208
253767701071640753708
2626530029714589074464
27187231524430927518240

[1,2,6,28,150,848,4988,30320,189030,1201792,
 7761296,50774280,335776204,2241022944,15075584864,
 102113820256,695842808070,4767068036992,
 32813466593552,226829615262744,1574027068685944,
 10960566883613504,76564394477117688,
 536383955787886208,3767701071640753708,
 26530029714589074464,187231524430927518240]