1,2

Maximum number of squares attacked by a queen on an n X n chessboard - Stewart Gordon (smjg(AT)iname.com), Mar 23 2001

Number of squares attacked by a queen on a toroidal chessboard - Diego Torres (torresvillarroel(AT)hotmail.com), May 19 2001

List of squared distances between points of diamond 'lattice' with minimal distance sqrt(3) - Arnold Neumaier (Arnold.Neumaier(AT)univie.ac.at), Aug 01 2003

a(n) = a(n-1) + 4 + (-1)^n = a(n-1) + a(n-2) - a(n-3) = A042948(n) + A005843(n); g.f.: (3x+5*x^2)/((1-x)*(1-x^2)).

Cf. A042948.

Sequence in context: A081858 A111132 A003234 this_sequence A003623 A058572 A105410

Adjacent sequences: A047467 A047468 A047469 this_sequence A047471 A047472 A047473

nonn

njas