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A026306 a(n) = T(2n,n+1), where T is the array in A026300. 0
0, 2, 12, 69, 392, 2235, 12804, 73710, 426192, 2473704, 14405800, 84137130, 492652824, 2891110235, 16999928820, 100136858625, 590778928800, 3490370847876, 20647839813048, 122287764072938, 725023671281520, 4302720916638417 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

CROSSREFS

Sequence in context: A174327 A128103 A078839 * A116398 A001542 A059229

Adjacent sequences:  A026303 A026304 A026305 * A026307 A026308 A026309

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.