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A057397 as a simple table

n a(n)
0 1
1 0
2 0
3 6
4 9
5 36
6 99
7 342
8 1188
9 4314
10 16308
11 61362
12 244344
13 969480
14 3990681
15 16401402
16 69105645
17 292097790
18 1254450831
19 5412716802
20 23608046241
21 103512674946
22 457382482686
23 2031136391286
24 9072992530731

[1,0,0,6,9,36,99,342,1188,4314,16308,61362,244344,
 969480,3990681,16401402,69105645,292097790,
 1254450831,5412716802,23608046241,103512674946,
 457382482686,2031136391286,9072992530731]

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Last modified March 28 11:59 EDT 2024. Contains 371254 sequences. (Running on oeis4.)