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A235956 as a simple table

n a(n)
1 50
2 228
3 928
4 3574
5 13346
6 48848
7 176420
8 631130
9 2242678
10 7930164
11 27941848
12 98196574
13 344438730
14 1206482520
15 4221685708
16 14761290914
17 51584989022
18 180196526268
19 629274809856
20 2197047322662
21 7669531252530
22 26769919917152

[50,228,928,3574,13346,48848,176420,631130,
 2242678,7930164,27941848,98196574,344438730,
 1206482520,4221685708,14761290914,51584989022,
 180196526268,629274809856,2197047322662,
 7669531252530,26769919917152]

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Last modified December 7 18:19 EST 2021. Contains 349585 sequences. (Running on oeis4.)