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A124427 as a simple table

n a(n)
0 0
1 1
2 3
3 9
4 30
5 112
6 463
7 2095
8 10279
9 54267
10 306298
11 1838320
12 11677867
13 78207601
14 550277003
15 4055549053
16 31224520322
17 250547144156
18 2090779592827
19 18110124715919
20 162546260131455
21 1509352980864191
22 14478981877739094
23 143299752100925452
24 1461455003961745247

[0,1,3,9,30,112,463,2095,10279,54267,306298,
 1838320,11677867,78207601,550277003,4055549053,
 31224520322,250547144156,2090779592827,
 18110124715919,162546260131455,1509352980864191,
 14478981877739094,143299752100925452,
 1461455003961745247]

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Last modified January 21 17:07 EST 2019. Contains 319350 sequences. (Running on oeis4.)