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A144141 a(n) = Hermite(n,2). 3
1, 4, 14, 40, 76, -16, -824, -3104, -880, 46144, 200416, -121216, -4894016, -16666880, 60576896, 708980224, 1018614016, -18612911104, -109084520960, 233726715904, 5080118660096, 10971406004224, -169479359707136, -1160659303014400, 3153413334470656 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..729

FORMULA

From G. C. Greubel, Jul 10 2018: (Start)

E.g.f.: exp(4*x - x^2).

a(n) = Sum_{k=0..floor(n/2)} (-1)^k*n!*4^(n-2*k)/(k!*(n-2*k)!). (End)

MATHEMATICA

lst={}; Do[AppendTo[lst, HermiteH[n, 2]], {n, 0, 7^2}]; lst

HermiteH[Range[0, 30], 2]  (* Harvey P. Dale, May 20 2012 *)

PROG

(PARI) for(n=0, 50, print1(polhermite(n, 2), ", " )) \\ G. C. Greubel, Jul 10 2018

(MAGMA) [(&+[(-1)^k*Factorial(n)*(4)^(n-2*k)/( Factorial(k) *Factorial(n-2*k)): k in [0..Floor(n/2)]]): n in [0..30]]; // G. C. Greubel, Jul 10 2018

CROSSREFS

Cf. A000898, A000321, A062267.

Sequence in context: A055279 A074083 A182819 * A187594 A326482 A331758

Adjacent sequences:  A144138 A144139 A144140 * A144142 A144143 A144144

KEYWORD

sign

AUTHOR

Vladimir Joseph Stephan Orlovsky, Sep 11 2008

STATUS

approved

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Last modified January 21 04:24 EST 2021. Contains 340332 sequences. (Running on oeis4.)