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A222850 as a simple table

na(n)
12
251
3737
419446
5292257
67998180
7124148448
83439829096
954306296841
101515901033301
1124205923008005
12678825974471631
1310927863709310867
14307435863252751539
154979572918586911445
16140414743437294171876

[2,51,737,19446,292257,7998180,124148448,
 3439829096,54306296841,1515901033301,
 24205923008005,678825974471631,10927863709310867,
 307435863252751539,4979572918586911445,
 140414743437294171876]