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Search: id:A090164
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A090164 Number of configurations of Sam Loyd's sliding block 15-puzzle that require a minimum of n moves to be reached, starting with the empty square at one of the 4 central squares. +0
3
1, 4, 10, 20, 38, 80, 174, 372, 762, 1540, 3072, 6196, 12356, 24516, 48179, 94356 (list; graph; listen)
OFFSET

0,2

MAPLE

See link in A089473.

CROSSREFS

Cf. A087725, A089484, A090165.

Sequence in context: A008058 A038420 A008254 this_sequence A128640 A128641 A164617

Adjacent sequences: A090161 A090162 A090163 this_sequence A090165 A090166 A090167

KEYWORD

fini,more,nonn

AUTHOR

Hugo Pfoertner (hugo(AT)pfoertner.org), Nov 27 2003

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Last modified December 20 13:54 EST 2009. Contains 171081 sequences.


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