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A238721 as a simple table

n a(n)
1 4
2 10
3 40
4 86
5 336
6 704
7 2704
8 5660
9 21504
10 45176
11 170464
12 359400
13 1350272
14 2854496
15 10694912
16 22650672
17 84716224
18 179637056
19 671110848
20 1424180800
21 5316817088
22 11288673952
23 42124029504
24 89466980000
25 333750473152
26 708999096096
27 2644373950784
28 5618300601952

[4,10,40,86,336,704,2704,5660,21504,45176,170464,
 359400,1350272,2854496,10694912,22650672,84716224,
 179637056,671110848,1424180800,5316817088,
 11288673952,42124029504,89466980000,333750473152,
 708999096096,2644373950784,5618300601952]

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Last modified July 15 06:58 EDT 2024. Contains 374324 sequences. (Running on oeis4.)