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A277265 as a simple table

n a(n)
1 0
2 1
3 0
4 2
5 12
6 2
7 9
8 1200
9 3280
10 12
11 44
12 498960
13 97193600
14 5972400
15 312
16 265
17 415981440
18 14591060915200
19 73866846715200
20 31918489344
21 9600
22 1854
23 615853022400
24 7390721380256614400
25 9022243072072662432000
26 287350869074488547328
27 393956489203200
28 416880
29 14833
30 1477095102362880

[0,1,0,2,12,2,9,1200,3280,12,44,498960,97193600,
 5972400,312,265,415981440,14591060915200,
 73866846715200,31918489344,9600,1854,615853022400,
 7390721380256614400,9022243072072662432000,
 287350869074488547328,393956489203200,416880,
 14833,1477095102362880]

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Last modified May 16 14:39 EDT 2021. Contains 343949 sequences. (Running on oeis4.)