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A121955 as a simple table

n a(n)
1 0
2 9
3 17
4 72
5 209
6 711
7 2250
8 7357
9 23693
10 76848
11 248413
12 804307
13 2602122
14 8421705
15 27251521
16 88190472
17 285386041
18 923535567
19 2988612714
20 9671371877
21 31297187845
22 101279874144
23 327748481957
24 1060616489147
25 3432226859754

[0,9,17,72,209,711,2250,7357,23693,76848,248413,
 804307,2602122,8421705,27251521,88190472,
 285386041,923535567,2988612714,9671371877,
 31297187845,101279874144,327748481957,
 1060616489147,3432226859754]

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Last modified April 19 21:09 EDT 2024. Contains 371798 sequences. (Running on oeis4.)