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A081671 as a simple table

n a(n)
0 1
1 4
2 18
3 88
4 454
5 2424
6 13236
7 73392
8 411462
9 2325976
10 13233628
11 75682512
12 434662684
13 2505229744
14 14482673832
15 83940771168
16 487610895942
17 2838118247064
18 16547996212044
19 96635257790352
20 565107853947444
21 3308820294176016
22 19395905063796312
23 113814537122646432

[1,4,18,88,454,2424,13236,73392,411462,2325976,
 13233628,75682512,434662684,2505229744,
 14482673832,83940771168,487610895942,
 2838118247064,16547996212044,96635257790352,
 565107853947444,3308820294176016,
 19395905063796312,113814537122646432]

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Last modified March 29 09:44 EDT 2024. Contains 371268 sequences. (Running on oeis4.)