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A286921 as a simple table

n a(n)
0 1
1 1
2 10
3 1
4 55
5 2575
6 1
7 550
8 253000
9 250525000
10 1
11 5050
12 25007500
13 250025500000
14 2500000075000000
15 1
16 50500
17 2500300000
18 250002775000000
19 25000000255000000000
20 2500000000502500000000000
21 1
22 500500
23 250000750000
24 250000250500000000
25 250000000000750000000000
26 250000000000250500000000000000
27 250000000000000000750000000000000000

[1,1,10,1,55,2575,1,550,253000,250525000,1,5050,
 25007500,250025500000,2500000075000000,1,50500,
 2500300000,250002775000000,25000000255000000000,
 2500000000502500000000000,1,500500,250000750000,
 250000250500000000,250000000000750000000000,
 250000000000250500000000000000,
 250000000000000000750000000000000000]

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Last modified March 28 05:02 EDT 2024. Contains 371235 sequences. (Running on oeis4.)