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A187307 Hankel transform of an alternating sum of Motzkin numbers. 1
1, 2, 2, -1, -5, -5, 1, 8, 8, -1, -11, -11, 1, 14, 14, -1, -17, -17, 1, 20, 20, -1, -23, -23, 1, 26, 26, -1, -29, -29, 1, 32, 32, -1, -35, -35, 1, 38, 38, -1, -41, -41, 1, 44, 44, -1, -47, -47, 1, 50, 50, -1, -53, -53, 1, 56, 56, -1, -59, -59, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Hankel transform of A187306.

LINKS

Table of n, a(n) for n=0..60.

Index to sequences with linear recurrences with constant coefficients, signature (2,-3,2,-1)

FORMULA

G.f.: (1+x^2-x^3)/(1-x+x^2)^2.

CROSSREFS

Sequence in context: A158068 A210879 A176265 * A123971 A204851 A114292

Adjacent sequences:  A187304 A187305 A187306 * A187308 A187309 A187310

KEYWORD

sign,easy

AUTHOR

Paul Barry, Mar 08 2011

STATUS

approved

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Last modified April 21 06:36 EDT 2014. Contains 240824 sequences.