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A054147 T(2n,n), array T as in A054144. 0
0, 3, 21, 108, 492, 2100, 8604, 34272, 133728, 513648, 1948560, 7318080, 27256896, 100815936, 370684608, 1355996160, 4938304512, 17914202880, 64760732928, 233390693376, 838784916480, 3006980379648, 10755352869888 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

G.f.: (-3x^2+3x)/(1-4x+2x^2)^2.

CROSSREFS

Sequence in context: A128281 A034268 A140451 * A043012 A122120 A080952

Adjacent sequences:  A054144 A054145 A054146 * A054148 A054149 A054150

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu), Mar 18 2000

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Last modified February 17 23:58 EST 2012. Contains 206085 sequences.