1,2

Jocelyn Quaintance, Combinatoric Enumeration of Two-Dimensional Proper Arrays, Discrete Math., 307 (2007), 1844-1864.

See Quaintance reference for generating functions that produce A129872-A129886.

Sequence in context: A151245 A151246 A152807 this_sequence A059371 A007234 A096244

Adjacent sequences: A129869 A129870 A129871 this_sequence A129873 A129874 A129875

nonn

N. J. A. Sloane (njas(AT)research.att.com), May 26 2007