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A355507 as a simple table

n a(n)
0 1
1 0
2 0
3 0
4 0
5 5
6 15
7 70
8 420
9 3024
10 28350
11 272250
12 2875950
13 33333300
14 420840420
15 5763671550
16 84799915200
17 1334007397800
18 22343877115560
19 396971840865600
20 7456250728017000
21 147612122975772000
22 3071792315894841000
23 67030983483724953000
24 1530448652869851191400

[1,0,0,0,0,5,15,70,420,3024,28350,272250,2875950,
 33333300,420840420,5763671550,84799915200,
 1334007397800,22343877115560,396971840865600,
 7456250728017000,147612122975772000,
 3071792315894841000,67030983483724953000,
 1530448652869851191400]

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Last modified May 15 19:42 EDT 2024. Contains 372549 sequences. (Running on oeis4.)