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A188492 as a simple table

n a(n)
0 0
1 0
2 2
3 6
4 14
5 38
6 124
7 400
8 1232
9 3712
10 11288
11 34628
12 106352
13 325772
14 996712
15 3050352
16 9340170
17 28602014
18 87576426
19 268129662
20 820931640
21 2513509536
22 7695861408
23 23563048304
24 72144604576
25 220890113784
26 676315440208
27 2070725515096

[0,0,2,6,14,38,124,400,1232,3712,11288,34628,
 106352,325772,996712,3050352,9340170,28602014,
 87576426,268129662,820931640,2513509536,
 7695861408,23563048304,72144604576,220890113784,
 676315440208,2070725515096]

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Last modified August 24 14:10 EDT 2019. Contains 326281 sequences. (Running on oeis4.)