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A323470 On a spirally numbered chessboard, with labels starting at 0, this is the number of the final step that a (1,n) leaper makes before getting trapped, or -1 if it never gets trapped. 7
-1, 2015, 3722, 13102, 14569, 26966, 101249, 158734, 132687, 220438, 144840, 646727, 350719, 66182, 75258, 248763, 118693, 307482, 238207, 189158, 139638, 183820, 151015, 171075, 114186, 262234, 178611, 257631, 124474, 178861, 143673, 196794, 60706, 309819 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A (1,2) leaper is a chess knight.

a(2)-a(5) were computed by Daniël Karssen.

LINKS

Rémy Sigrist, Table of n, a(n) for n = 1..1000

Rémy Sigrist, C++ program for A323470

Neil Sloane and Brady Haran, The Trapped Knight, Numberphile video (2019)

PROG

(C++) See Links section.

CROSSREFS

The sequences involved in this set of related sequences are A316884, A316967, A316667, A316328, A317106, A317105, A317416, A317415, A317438, A317437, and A323469, A323470, A323471, A323472.

Sequence in context: A191421 A250836 A076666 * A189188 A076582 A323749

Adjacent sequences:  A323467 A323468 A323469 * A323471 A323472 A323473

KEYWORD

sign

AUTHOR

N. J. A. Sloane, Jan 28 2019

EXTENSIONS

More terms from Rémy Sigrist, Jan 29 2019

STATUS

approved

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Last modified June 25 12:01 EDT 2019. Contains 324352 sequences. (Running on oeis4.)