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A217952 as a simple table

n a(n)
1 4
2 16
3 50
4 130
5 296
6 610
7 1163
8 2097
9 3670
10 6434
11 11666
12 22313
13 44907
14 93206
15 194831
16 403141
17 818641
18 1628770
19 3184993
20 6157786
21 11854873
22 22877202
23 44459405
24 87168326
25 172249773
26 342083954
27 680463827
28 1351826291
29 2677343192
30 5283369867

[4,16,50,130,296,610,1163,2097,3670,6434,11666,
 22313,44907,93206,194831,403141,818641,1628770,
 3184993,6157786,11854873,22877202,44459405,
 87168326,172249773,342083954,680463827,1351826291,
 2677343192,5283369867]

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Last modified April 22 18:24 EDT 2021. Contains 343177 sequences. (Running on oeis4.)