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A077445 as a simple table

n a(n)
1 4
2 20
3 116
4 676
5 3940
6 22964
7 133844
8 780100
9 4546756
10 26500436
11 154455860
12 900234724
13 5246952484
14 30581480180
15 178241928596
16 1038870091396
17 6054978619780
18 35291001627284
19 205691031143924
20 1198855185236260

[4,20,116,676,3940,22964,133844,780100,4546756,
 26500436,154455860,900234724,5246952484,
 30581480180,178241928596,1038870091396,
 6054978619780,35291001627284,205691031143924,
 1198855185236260]

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)