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A143807 Number of geodesics between a pair of perfect states in the Tower of Hanoi with 4 pegs and n disks. 0
1, 2, 2, 22, 40, 18, 2468, 11698, 11426, 2178, 74056628 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..11.

CROSSREFS

Sequence A007664 gives the lengths of the geodesics being counted by the present sequence (conjecturally this is true for all n; experimentally it is true for the first 20 terms)

Sequence in context: A153438 A190632 A036110 * A118454 A118326 A212847

Adjacent sequences:  A143804 A143805 A143806 * A143808 A143809 A143810

KEYWORD

hard,nonn

AUTHOR

Jason Behrstock (jason(AT)math.columbia.edu), Sep 01 2008

STATUS

approved

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Last modified March 2 08:39 EST 2021. Contains 341745 sequences. (Running on oeis4.)