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A137158 as a simple table

n a(n)
0 1
1 4
2 22
3 228
4 4749
5 200240
6 17034964
7 2913479848
8 999402129243
9 686662003846640
10 944294243796543974
11 2598186366278914473948
12 14300408328085246335179009
13 157434326611214704329370130880

[1,4,22,228,4749,200240,17034964,2913479848,
 999402129243,686662003846640,944294243796543974,
 2598186366278914473948,14300408328085246335179009,
 157434326611214704329370130880]

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Last modified February 25 11:19 EST 2021. Contains 341606 sequences. (Running on oeis4.)