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A186231 Expansion of (2F1( (-1/4, 1/4); (-1/2), 16*x] - 1)/(2*x). 2
1, 15, 210, 3003, 43758, 646646, 9657700, 145422675, 2203961430, 33578000610, 513791607420, 7890371113950, 121548660036300, 1877405874732108, 29065024282889672, 450883717216034179, 7007092303604022630, 109069992321755544170, 1700179760011004467468, 26536589497469056215210, 414670662257153823494820 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Combinatorial interpretation welcome.

Probably a class of paths (Cf. A135404, A000888).

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

FORMULA

a(n) = A001791(2n+1). - R. J. Mathar, Jul 10 2012

MATHEMATICA

CoefficientList[Series[(HypergeometricPFQ[{-(1/4), 1/4}, {-(1/2)}, 16 x] - 1)/(2 x), {x, 0, 20}], x]

CROSSREFS

Cf. A186229.

Sequence in context: A170648 A170696 A170734 * A001880 A240682 A113362

Adjacent sequences:  A186228 A186229 A186230 * A186232 A186233 A186234

KEYWORD

nonn

AUTHOR

Olivier Gérard, Feb 15 2011

STATUS

approved

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Last modified September 21 16:22 EDT 2014. Contains 247025 sequences.