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A090578 as a simple table

n a(n)
0 1
1 4
2 10
3 30
4 74
5 222
6 546
7 1628
8 3978
9 11810
10 28658
11 84520
12 203562
13 596520
14 1425924
15 4150232
16 9838116
17 28418002
18 66805554

[1,4,10,30,74,222,546,1628,3978,11810,28658,84520,
 203562,596520,1425924,4150232,9838116,28418002,
 66805554]

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Last modified March 28 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)