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A056788 as a simple table

na(n)
12
25
331
4283
53381
649781
7870199
817600759
9404197705
1010387420489
11295311670611
129201412118867
13311791207040509
1411414881932150269
15449005897206417391
1618884637964090410991
17845687005960046315793

[2,5,31,283,3381,49781,870199,17600759,404197705,
 10387420489,295311670611,9201412118867,
 311791207040509,11414881932150269,
 449005897206417391,18884637964090410991,
 845687005960046315793]