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A277759 as a simple table

n a(n)
0 1
1 1
2 4
3 30
4 324
5 4540
6 78060
7 1589448
8 37388400
9 997513200
10 29759790240
11 981669324240
12 35475203063520
13 1393746645107232
14 59147129937893088
15 2696314664384853120
16 131405475202661963520
17 6817779852438948837120
18 375193156508083422581760

[1,1,4,30,324,4540,78060,1589448,37388400,
 997513200,29759790240,981669324240,35475203063520,
 1393746645107232,59147129937893088,
 2696314664384853120,131405475202661963520,
 6817779852438948837120,375193156508083422581760]

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Last modified September 22 01:06 EDT 2023. Contains 365503 sequences. (Running on oeis4.)