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A056338 as a simple table

n a(n)
1 0
2 0
3 0
4 1
5 6
6 37
7 183
8 876
9 3930
10 17179
11 73095
12 306323
13 1267266
14 5198374
15 21182337
16 85910040
17 347187210
18 1399447578
19 5629911015
20 22616239535
21 90754854843
22 363890053582
23 1458172596903
24 5840531328120
25 23385650196084

[0,0,0,1,6,37,183,876,3930,17179,73095,306323,
 1267266,5198374,21182337,85910040,347187210,
 1399447578,5629911015,22616239535,90754854843,
 363890053582,1458172596903,5840531328120,
 23385650196084]

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Last modified May 5 19:09 EDT 2021. Contains 343573 sequences. (Running on oeis4.)