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A186123 as a simple table

n a(n)
1 50
2 254
3 946
4 4254
5 17794
6 79782
7 350266
8 1574348
9 7039308
10 31791832
11 143422488
12 649853710
13 2944761666
14 13369773598
15 60719993934
16 276010194872
17 1254976548136
18 5708622661652
19 25972110429080
20 118188673239130
21 537890728864526

[50,254,946,4254,17794,79782,350266,1574348,
 7039308,31791832,143422488,649853710,2944761666,
 13369773598,60719993934,276010194872,
 1254976548136,5708622661652,25972110429080,
 118188673239130,537890728864526]

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Last modified January 23 11:42 EST 2022. Contains 350512 sequences. (Running on oeis4.)