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A027056 as a simple table

n a(n)
1 0
2 2
3 4
4 8
5 18
6 42
7 102
8 256
9 658
10 1722
11 4570
12 12264
13 33212
14 90626
15 248892
16 687360
17 1907506
18 5316266
19 14873082
20 41751944
21 117567784
22 331979650
23 939807344
24 2666718976
25 7583071868
26 21605822594
27 61672362872
28 176338826728
29 505001067346
30 1448365610778
31 4159725843526
32 11962301199744

[0,2,4,8,18,42,102,256,658,1722,4570,12264,33212,
 90626,248892,687360,1907506,5316266,14873082,
 41751944,117567784,331979650,939807344,2666718976,
 7583071868,21605822594,61672362872,176338826728,
 505001067346,1448365610778,4159725843526,
 11962301199744]

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Last modified September 1 11:12 EDT 2024. Contains 375589 sequences. (Running on oeis4.)