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A074547 as a simple table

n a(n)
0 3
1 12
2 50
3 216
4 962
5 4392
6 20450
7 96696
8 462722
9 2234952
10 10873250
11 53199576
12 261449282
13 1289406312
14 6376734050
15 31605668856
16 156925904642
17 780248462472
18 3883804162850
19 19349526496536
20 96470430052802
21 481245665067432

[3,12,50,216,962,4392,20450,96696,462722,2234952,
 10873250,53199576,261449282,1289406312,6376734050,
 31605668856,156925904642,780248462472,
 3883804162850,19349526496536,96470430052802,
 481245665067432]

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Last modified June 13 00:57 EDT 2021. Contains 344980 sequences. (Running on oeis4.)