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 A196508 2^n*(n^2-n+4)-4. 1
 0, 4, 20, 76, 252, 764, 2172, 5884, 15356, 38908, 96252, 233468, 557052, 1310716, 3047420, 7012348, 15990780, 36175868, 81264636, 181403644, 402653180, 889192444, 1954545660, 4278190076, 9328132092, 20266876924, 43889197052 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 REFERENCES Jolley, Summation of Series, Dover (1961), eq. (46) on page 8. LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..3000 Index to sequences with linear recurrences with constant coefficients, signature (7,-18,20,-8) FORMULA a(n) = 2*2 +4*4 + 7*8+ 11*16+ 16*32 + .. (n terms of A000124*A000079). a(n) = 4*A053545(n). G.f. 4*x*(1-2*x+2*x^2) / ( (x-1)*(2*x-1)^3 ). PROG (MAGMA) [2^n*(n^2-n+4)-4: n in [0..30]]; // Vincenzo Librandi, Oct 05 2011 CROSSREFS Sequence in context: A061981 A054611 A196432 * A121257 A145563 A125669 Adjacent sequences:  A196505 A196506 A196507 * A196509 A196510 A196511 KEYWORD nonn,easy AUTHOR R. J. Mathar, Oct 03 2011 STATUS approved

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Last modified May 19 11:12 EDT 2013. Contains 225429 sequences.