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A115867 as a simple table

n a(n)
1 4
2 30
3 180
4 1078
5 6468
6 38808
7 232845
8 1397067
9 8382394
10 50294353
11 301766110
12 1810596649
13 10863579883
14 65181479283
15 391088875684
16 2346533254087
17 14079199524505
18 84475197147008
19 506851182882025
20 3041107097292125
21 18246642583752723
22 109479855502516309
23 656879133015097824

[4,30,180,1078,6468,38808,232845,1397067,8382394,
 50294353,301766110,1810596649,10863579883,
 65181479283,391088875684,2346533254087,
 14079199524505,84475197147008,506851182882025,
 3041107097292125,18246642583752723,
 109479855502516309,656879133015097824]

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Last modified May 29 07:24 EDT 2022. Contains 354122 sequences. (Running on oeis4.)