A082135 Expansion of e.g.f. x*exp(4*x)*cosh(x).

0, 1, 8, 51, 304, 1765, 10104, 57239, 321248, 1787337, 9864040, 54035707, 294031632, 1590368429, 8556082136, 45812239455, 244255416256, 1297362967441, 6867617339592, 36243304518083, 190746485895920, 1001394643462773

Offset

0,3

Comments

Binomial transform of A082134. 4th binomial transform of (0,1,0,3,0,5,0,7,...).

Links

G. C. Greubel, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (16,-94,240,-225).

Formula

a(n) = n*(3^(n-1) + 5^(n-1))/2.

E.g.f.: x*exp(4x)*cosh(x).

G.f.: x*(17*x^2-8*x+1) / ((3*x-1)^2*(5*x-1)^2). [Colin Barker, Dec 10 2012]

Mathematica

With[{nn = 20}, CoefficientList[Series[x Exp[4*x] Cosh[x], {x, 0, nn}], x] Range[0, nn]!] (* T. D. Noe, Dec 10 2012 *)
Table[n*(3^(n-1)+5^(n-1))/2, {n, 0, 30}] (* G. C. Greubel, Feb 05 2018 *)

Prog

(PARI) for(n=0, 30, print1(n*(3^(n-1)+5^(n-1))/2, ", ")) \\ G. C. Greubel, Feb 05 2018
(Magma) [n*(3^(n-1)+5^(n-1))/2: n in [0..30]]; // G. C. Greubel, Feb 05 2018

Crossrefs

Cf. A082133, A082136.

Sequence in context: A240360 A069325 A295348 * A153594 A344055 A316594

Adjacent sequences: A082132 A082133 A082134 * A082136 A082137 A082138

Keyword

easy,nonn

Author

Paul Barry, Apr 06 2003

Status

approved