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A271286 as a simple table

n a(n)
0 1
1 4
2 40
3 200
4 872
5 3624
6 14760
7 59560
8 239272
9 959144
10 3840680
11 15370920
12 61500072
13 246033064
14 984197800
15 3936922280 

[1,4,40,200,872,3624,14760,59560,239272,959144,
 3840680,15370920,61500072,246033064,984197800,
 3936922280]

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Last modified April 19 06:16 EDT 2024. Contains 371782 sequences. (Running on oeis4.)