A174592 - OEIS

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A174592 as a simple table

n	a(n)
1	2
2	46
3	658
4	9182
5	127906
6	1781518
7	24813362
8	345605566
9	4813664578
10	67045698542
11	933826115026
12	13006519911838
13	181157452650722
14	2523197817198286
15	35143611988125298
16	489487370016555902
17	6817679568243657346

[2,46,658,9182,127906,1781518,24813362,345605566, 4813664578,67045698542,933826115026, 13006519911838,181157452650722,2523197817198286, 35143611988125298,489487370016555902, 6817679568243657346]