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A054137 as a simple table

n a(n)
3 2
4 8
5 31
6 97
7 264
8 654
9 1518
10 3366
11 7227
12 15169
13 31339
14 64043
15 129906
16 262192
17 527444
18 1058764
19 2122373
20 4250731
21 8508777
22 17026409
23 34063444
24 68139538
25 136294026
26 272605602
27 545231679
28 1090487109
29 2181001623

[2,8,31,97,264,654,1518,3366,7227,15169,31339,
 64043,129906,262192,527444,1058764,2122373,
 4250731,8508777,17026409,34063444,68139538,
 136294026,272605602,545231679,1090487109,
 2181001623]

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Last modified September 19 05:33 EDT 2020. Contains 337176 sequences. (Running on oeis4.)