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A321031 as a simple table

n a(n)
0 1
1 1
2 4
3 31
4 351
5 5144
6 91816
7 1918578
8 45687682
9 1216354021
10 35689352250
11 1141323078031
12 39429988969021
13 1461049507764175
14 57720478019188989
15 2419008380691088543
16 107083662651332423339
17 4988596265684542112304
18 243781041304397011647766

[1,1,4,31,351,5144,91816,1918578,45687682,
 1216354021,35689352250,1141323078031,
 39429988969021,1461049507764175,57720478019188989,
 2419008380691088543,107083662651332423339,
 4988596265684542112304,243781041304397011647766]

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Last modified November 28 16:33 EST 2021. Contains 349413 sequences. (Running on oeis4.)