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A201687 as a simple table

n a(n)
1 0
2 2
3 2
4 6
5 14
6 44
7 134
8 462
9 1616
10 6062
11 23306
12 93996
13 389102
14 1671158
15 7360256
16 33418374
17 155359922
18 741476492
19 3617591462
20 18065875422
21 92087408048
22 479382896030
23 2543670789962
24 13759520646636
25 75769638724382
26 424727826838886
27 2420944511425472

[0,2,2,6,14,44,134,462,1616,6062,23306,93996,
 389102,1671158,7360256,33418374,155359922,
 741476492,3617591462,18065875422,92087408048,
 479382896030,2543670789962,13759520646636,
 75769638724382,424727826838886,2420944511425472]

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Last modified August 11 05:51 EDT 2024. Contains 375059 sequences. (Running on oeis4.)