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A126948 as a simple table

n a(n)
0 0
1 0
2 4
3 12
4 34
5 110
6 354
7 1120
8 3552
9 11290
10 35862
11 113884
12 361702
13 1148810
14 3648670
15 11588338
16 36805222
17 116895404
18 371266018
19 1179160836
20 3745078428
21 11894570660
22 37777796510
23 119984315496
24 381076645196
25 1210319938646
26 3844041278068
27 12208882029838

[0,0,4,12,34,110,354,1120,3552,11290,35862,113884,
 361702,1148810,3648670,11588338,36805222,
 116895404,371266018,1179160836,3745078428,
 11894570660,37777796510,119984315496,381076645196,
 1210319938646,3844041278068,12208882029838]

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Last modified September 19 07:24 EDT 2020. Contains 337178 sequences. (Running on oeis4.)