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A222271 as a simple table

n a(n)
1 0
2 4
3 4
4 81
5 364
6 5996
7 27980
8 507909
9 2380692
10 44501178
11 208717216
12 3948025953
13 18510211252
14 352744650956
15 1653908717680
16 31689827693324
17 148654828631998
18 2860214905912758
19 13427178703144724
20 259196177077920492

[0,4,4,81,364,5996,27980,507909,2380692,44501178,
 208717216,3948025953,18510211252,352744650956,
 1653908717680,31689827693324,148654828631998,
 2860214905912758,13427178703144724,
 259196177077920492]

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Last modified February 26 10:34 EST 2024. Contains 370346 sequences. (Running on oeis4.)