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A231998 as a simple table

n a(n)
1 4
2 6
3 16
4 39
5 81
6 168
7 361
8 780
9 1681
10 3612
11 7744
12 16620
13 35721
14 76755
15 164836
16 354006
17 760384
18 1633275
19 3508129
20 7535088
21 16184529
22 34762680
23 74666881
24 160377096
25 344473600
26 739894200
27 1589218225
28 3413480691
29 7331811876
30 15747991350

[4,6,16,39,81,168,361,780,1681,3612,7744,16620,
 35721,76755,164836,354006,760384,1633275,3508129,
 7535088,16184529,34762680,74666881,160377096,
 344473600,739894200,1589218225,3413480691,
 7331811876,15747991350]

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Last modified May 16 11:35 EDT 2022. Contains 353704 sequences. (Running on oeis4.)