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A034488 as a simple table

n a(n)
0 4
1 12
2 50
3 252
4 1394
5 8052
6 47450
7 282252
8 1686434
9 10097892
10 60526250
11 362976252
12 2177317874
13 13062296532
14 78368963450
15 470199366252
16 2821153019714
17 16926788715972
18 101560344351050
19 609360902796252
20 3656161927895954
21 21936961102828212

[4,12,50,252,1394,8052,47450,282252,1686434,
 10097892,60526250,362976252,2177317874,
 13062296532,78368963450,470199366252,
 2821153019714,16926788715972,101560344351050,
 609360902796252,3656161927895954,
 21936961102828212]

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Last modified November 18 09:55 EST 2019. Contains 329261 sequences. (Running on oeis4.)