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A274713 as a simple table

n a(n)
1 1
2 15
3 966
4 145750
5 40075035
6 17505749898
7 11143554045652
8 9741955019900400
9 11201516780955125625
10 16392038075086211019625
11 29749840488672593296243236
12 65580126734167548918100615020
13 172597131674172062132363512309613
14 534584200037719212882636004559739000
15 1924887533450780657560944228447179522880
16 7973126100358260458973226689851075932667520
17 37645241791600906804871080818625037726247519045

[1,15,966,145750,40075035,17505749898,
 11143554045652,9741955019900400,
 11201516780955125625,16392038075086211019625,
 29749840488672593296243236,
 65580126734167548918100615020,
 172597131674172062132363512309613,
 534584200037719212882636004559739000,
 1924887533450780657560944228447179522880,
 7973126100358260458973226689851075932667520,
 37645241791600906804871080818625037726247519045]

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Last modified January 28 22:40 EST 2020. Contains 331328 sequences. (Running on oeis4.)