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A111686 as a simple table

n a(n)
1 2
2 15
3 144
4 1925
5 33648
6 726327
7 18636560
8 553680369
9 18684924840
10 705833193923
11 29502690532392
12 1351724235304365
13 67359683340291104
14 3627011494019437935
15 209846445862386234528
16 12982402818188717219657
17 855210841645834409812920

[2,15,144,1925,33648,726327,18636560,553680369,
 18684924840,705833193923,29502690532392,
 1351724235304365,67359683340291104,
 3627011494019437935,209846445862386234528,
 12982402818188717219657,855210841645834409812920]

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Last modified March 25 08:15 EDT 2019. Contains 321469 sequences. (Running on oeis4.)