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A006189 Number of paths on square lattice.
(Formerly M2891) 		0
1, 3, 11, 38, 126, 415, 1369, 4521 (list; graph; refs; listen; history; internal format)
OFFSET

3,2

REFERENCES

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

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

CROSSREFS

Sequence in context: A183511 A129962 A026361 * A092201 A026943 A047096

Adjacent sequences:  A006186 A006187 A006188 * A006190 A006191 A006192

KEYWORD

nonn,walk

AUTHOR

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

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Last modified February 16 07:39 EST 2012. Contains 205881 sequences.