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A228621
Number of s in {1,...,n}^n having shortest run with the same value of length 2.
2
2, 0, 12, 40, 210, 840, 5208, 23760, 148410, 786720, 5137440, 30051528, 207058488, 1318599240, 9540828480, 65319695136, 495194683680, 3608366801040, 28572937581140, 219952629498840, 1813839842408748, 14663194937503288, 125593649761912704, 1061139859894326000
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OFFSET
2,1
LINKS
Alois P. Heinz,
Table of n, a(n) for n = 2..180
EXAMPLE
a(2) = 2: [1,1], [2,2].
a(4) = 12: [1,1,2,2], [1,1,3,3], [1,1,4,4], [2,2,1,1], [2,2,3,3], [2,2,4,4], [3,3,1,1], [3,3,2,2], [3,3,4,4], [4,4,1,1], [4,4,2,2], [4,4,3,3].
CROSSREFS
Column k=2 of
A228617
.
Sequence in context:
A112261
A134831
A074001
*
A180189
A182437
A326860
Adjacent sequences:
A228618
A228619
A228620
*
A228622
A228623
A228624
KEYWORD
nonn
AUTHOR
Alois P. Heinz
, Aug 28 2013
STATUS
approved
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Last modified March 18 21:02 EDT 2024. Contains 370951 sequences. (Running on oeis4.)