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A033296 Number of paths from (0,0) to (3n,0) that stay in first quadrant (but may touch horizontal axis), where each step is (2,1),(1,2) or (1,-1) and start with (1,2). 1

%I

%S 1,6,42,326,2706,23526,211546,1951494,18366882,175674054,1702686090,

%T 16686795846,165079509042,1646340228006,16534463822010,

%U 167081444125702,1697551974416706,17330661859937670,177699201786231530

%N Number of paths from (0,0) to (3n,0) that stay in first quadrant (but may touch horizontal axis), where each step is (2,1),(1,2) or (1,-1) and start with (1,2).

%F z A^3, where A is the g. f. of A027307. Also: difference of A027307 and A032349.

%Y Cf. A027307, A032349.

%K nonn

%O 1,2

%A _Emeric Deutsch_

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Last modified August 18 08:57 EDT 2019. Contains 326077 sequences. (Running on oeis4.)