1,2

A persymmetric (or Hankel) matrix has M[ i,j ] = M[ i-k,j+k ] for all i and j (matrix is constant along antidiagonals).

I would love to find out what "consecutive" means here! Adjacent entries along the top row and right side must be consecutive? - N. J. A. Sloane (njas(AT)research.att.com).

Cf. A034917-A034921.

Sequence in context: A037170 A006399 A056800 this_sequence A151340 A134316 A049461

Adjacent sequences: A034916 A034917 A034918 this_sequence A034920 A034921 A034922

nonn

Fred Lunnon (fred(AT)csa5.cs.may.ie)