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 A158455 a(n) = 2^(n-1)*(n-1)!*(4*n+1). 0
 5, 18, 104, 816, 8064, 96000, 1336320, 21288960, 381911040, 7617576960, 167215104000, 4005730713600, 103985499340800, 2907670000435200, 87128076504268800, 2785241789890560000, 94612521108897792000, 3403308368004120576000, 129232476659005784064000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Exponential (EXP) transform of a(n) is A093620. LINKS FORMULA E.g.f.: Sum_{n>=1} a(n)*x^n/n! = 4*x/(1-2*x)-(1/2)*log(1-2*x). MATHEMATICA Table[2^(n-1)(n-1)!(4n+1), {n, 30}] (* Harvey P. Dale, Sep 22 2011 *) PROG (Magma) [2^(n-1)*Factorial(n-1)*(4*n+1): n in [1..25]]; // Vincenzo Librandi, Jul 06 2015 CROSSREFS Sequence in context: A165962 A127756 A228614 * A009442 A332784 A302435 Adjacent sequences: A158452 A158453 A158454 * A158456 A158457 A158458 KEYWORD nonn AUTHOR Karol A. Penson, Mar 19 2009 EXTENSIONS More terms from Harvey P. Dale, Sep 22 2011 STATUS approved

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Last modified November 30 02:32 EST 2022. Contains 358431 sequences. (Running on oeis4.)