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A268601 as a simple table

n a(n)
0 0
1 0
2 2
3 8
4 34
5 120
6 468
7 1680
8 6530
9 23960
10 93532
11 348656
12 1366260
13 5149872
14 20238696
15 76907808
16 302903874
17 1158168792
18 4569270156
19 17555689008
20 69356428284
21 267518448912
22 1058057586456
23 4094231982048
24 16208177203764
25 62887835652720
26 249156625186328
27 968943740083040
28 3841488520364200
29 14968574892499040
30 59379627044952528

[0,0,2,8,34,120,468,1680,6530,23960,93532,348656,
 1366260,5149872,20238696,76907808,302903874,
 1158168792,4569270156,17555689008,69356428284,
 267518448912,1058057586456,4094231982048,
 16208177203764,62887835652720,249156625186328,
 968943740083040,3841488520364200,
 14968574892499040,59379627044952528]

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Last modified December 16 20:08 EST 2018. Contains 318188 sequences. (Running on oeis4.)