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A007167 as a simple table

n a(n)
0 1
1 1
2 4
3 15
4 62
5 271
6 1247
7 5938
8 29113
9 145815
10 743384
11 3844314
12 20118681
13 106348391
14 567002169
15 3045455865
16 16463622763
17 89509216860
18 489103356753
19 2684663659765
20 14795752770278
21 81841297482116
22 454202999050433
23 2528381760697852

[1,1,4,15,62,271,1247,5938,29113,145815,743384,
 3844314,20118681,106348391,567002169,3045455865,
 16463622763,89509216860,489103356753,
 2684663659765,14795752770278,81841297482116,
 454202999050433,2528381760697852]

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Last modified January 22 22:16 EST 2020. Contains 331166 sequences. (Running on oeis4.)