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A155628 as a simple table

n a(n)
0 1
1 4
2 34
3 280
4 2146
5 15784
6 113554
7 807160
8 5699266
9 40091464
10 281426674
11 1973132440
12 13824509986
13 96821901544
14 677954637394
15 4746487768120
16 33228635602306
17 232613334118024
18 1628344878433714
19 11398620307466200

[1,4,34,280,2146,15784,113554,807160,5699266,
 40091464,281426674,1973132440,13824509986,
 96821901544,677954637394,4746487768120,
 33228635602306,232613334118024,1628344878433714,
 11398620307466200]

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Last modified April 11 22:01 EDT 2021. Contains 342888 sequences. (Running on oeis4.)