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A007070 as a simple table

n a(n)
0 1
1 4
2 14
3 48
4 164
5 560
6 1912
7 6528
8 22288
9 76096
10 259808
11 887040
12 3028544
13 10340096
14 35303296
15 120532992
16 411525376
17 1405035520
18 4797091328
19 16378294272
20 55918994432
21 190919389184
22 651839567872

[1,4,14,48,164,560,1912,6528,22288,76096,259808,
 887040,3028544,10340096,35303296,120532992,
 411525376,1405035520,4797091328,16378294272,
 55918994432,190919389184,651839567872]

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Last modified May 3 08:06 EDT 2024. Contains 372206 sequences. (Running on oeis4.)