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A056328 as a simple table

n a(n)
1 0
2 0
3 0
4 1
5 6
6 37
7 183
8 877
9 3930
10 17185
11 73095
12 306361
13 1267266
14 5198557
15 21182343
16 85910917
17 347187210
18 1399451545
19 5629911015
20 22616256721
21 90754855026
22 363890126677
23 1458172596903
24 5840531635357
25 23385650196090

[0,0,0,1,6,37,183,877,3930,17185,73095,306361,
 1267266,5198557,21182343,85910917,347187210,
 1399451545,5629911015,22616256721,90754855026,
 363890126677,1458172596903,5840531635357,
 23385650196090]

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Last modified October 15 18:11 EDT 2019. Contains 328037 sequences. (Running on oeis4.)