3,2

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

H. L. Abbott and D. Hanson, A lattice path problem, Ars Combin., 6 (1978), 163-178.

Sequence in context: A109000 A129962 A026361 this_sequence A092201 A026943 A047096

Adjacent sequences: A006186 A006187 A006188 this_sequence A006190 A006191 A006192

nonn,walk

N. J. A. Sloane (njas(AT)research.att.com).