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A217953 as a simple table

n a(n)
1 4
2 16
3 50
4 130
5 296
6 610
7 1163
8 2083
9 3558
10 5902
11 9734
12 16410
13 28969
14 54049
15 105529
16 211097
17 423650
18 840654
19 1636964
20 3121556
21 5839194
22 10760322
23 19647966
24 35780070
25 65376302
26 120393728
27 223926347
28 420463887
29 795087960
30 1508967508
31 2864523898

[4,16,50,130,296,610,1163,2083,3558,5902,9734,
 16410,28969,54049,105529,211097,423650,840654,
 1636964,3121556,5839194,10760322,19647966,
 35780070,65376302,120393728,223926347,420463887,
 795087960,1508967508,2864523898]

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Last modified April 18 22:45 EDT 2021. Contains 343098 sequences. (Running on oeis4.)