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A177117 as a simple table

n a(n)
0 1
1 4
2 4
3 18
4 60
5 270
6 1152
7 5254
8 24028
9 112606
10 533320
11 2559974
12 12404900
13 60657566
14 298826672
15 1482082774
16 7393735948
17 37078771678
18 186813107800
19 945165976262
20 4800095713844
21 24461416209374
22 125046320212160

[1,4,4,18,60,270,1152,5254,24028,112606,533320,
 2559974,12404900,60657566,298826672,1482082774,
 7393735948,37078771678,186813107800,945165976262,
 4800095713844,24461416209374,125046320212160]

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Last modified April 24 02:46 EDT 2024. Contains 371917 sequences. (Running on oeis4.)