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A090378
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Number of configurations that require a minimum of n moves to be reached, starting with the empty square at mid-side of a boundary of an infinitely large extension of Sam Loyd's sliding block 15-puzzle.
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1
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OFFSET
| 0,2
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COMMENTS
| Next term (unconfirmed): a(6)=409. If started with the empty square at mid-side of a boundary, the number of configurations reachable in the first floor((n-1)/2) moves in an n X n sliding block puzzle are given by this sequence.
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CROSSREFS
| Cf. A089483 3 X 3 puzzle started with empty square at mid-side, A090165.
Sequence in context: A198305 A146597 A115254 * A007180 A059506 A007575
Adjacent sequences: A090375 A090376 A090377 * A090379 A090380 A090381
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KEYWORD
| more,nonn
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AUTHOR
| Hugo Pfoertner (hugo(AT)pfoertner.org), Nov 27 2003
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