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A214198 as a simple table

n a(n)
0 0
1 0
2 0
3 2
4 4
5 12
6 36
7 116
8 384
9 1304
10 4504
11 15772
12 55832
13 199432
14 717816
15 2600680
16 9476800
17 34710000
18 127712560
19 471851180
20 1749864920
21 6511643720
22 24307501720
23 91000873560
24 341594374400
25 1285436348112
26 4848292800336
27 18325541062936
28 69405260675824
29 263353613108944
30 1001028051476656
31 3811242180811728
32 14533071892504448

[0,0,0,2,4,12,36,116,384,1304,4504,15772,55832,
 199432,717816,2600680,9476800,34710000,127712560,
 471851180,1749864920,6511643720,24307501720,
 91000873560,341594374400,1285436348112,
 4848292800336,18325541062936,69405260675824,
 263353613108944,1001028051476656,3811242180811728,
 14533071892504448]

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Last modified July 30 22:55 EDT 2024. Contains 374771 sequences. (Running on oeis4.)