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A223627 as a simple table

n a(n)
1 4
2 26
3 147
4 751
5 3560
6 15778
7 67030
8 274631
9 1088767
10 4218662
11 16015929
12 59653826
13 219063215
14 794078382
15 2843032061
16 10081383128
17 35429305737
18 123436612116
19 427070556002
20 1467917436855
21 5013326271265
22 17031672794426
23 57571509067410

[4,26,147,751,3560,15778,67030,274631,1088767,
 4218662,16015929,59653826,219063215,794078382,
 2843032061,10081383128,35429305737,123436612116,
 427070556002,1467917436855,5013326271265,
 17031672794426,57571509067410]

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Last modified March 28 14:02 EDT 2024. Contains 371254 sequences. (Running on oeis4.)