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A215855 as a simple table

n a(n)
5 1
6 15
7 245
8 3990
9 70707
10 1381695
11 30015205
12 724574235
13 19353600409
14 568456078190
15 18238727824135
16 635132015698180
17 23864603640853943
18 962474842863397305
19 41472195692307932196
20 1901422216588179732355
21 92422276780875117660486
22 4747285506511684927770980

[1,15,245,3990,70707,1381695,30015205,724574235,
 19353600409,568456078190,18238727824135,
 635132015698180,23864603640853943,
 962474842863397305,41472195692307932196,
 1901422216588179732355,92422276780875117660486,
 4747285506511684927770980]

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Last modified March 31 14:24 EDT 2020. Contains 333151 sequences. (Running on oeis4.)