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A119987 as a simple table

na(n)
12
23
313
43251
516777729
6387421219
711112006825560761
8443426488243037769948249630619149912487
91075911801979993982060429252856123779115487368830416064665177

[2,3,13,3251,16777729,387421219,11112006825560761,
 443426488243037769948249630619149912487,
 10759118019799939820604292528561237791154873688304\
 16064665177]