The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A026918 Sum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026907. 0
 1, 13, 41, 90, 185, 335, 601, 1020, 1729, 2857, 4721, 7710, 12593, 20459, 33241, 53880, 87337, 141421, 229001, 370650, 599921, 970823, 1571041, 2542140, 4113505, 6655945, 10769801, 17426070, 28196249, 45622667 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..29. Index entries for linear recurrences with constant coefficients, signature (1,3,-2,-3,1,1). FORMULA 8*Fibonacci(n+5) + (3/4)*[(n-1)(-1)^n - 17(n+3)]. - Ralf Stephan, May 13 2004 G.f. ( -1-12*x-25*x^2-12*x^3-x^4 ) / ( (x^2+x-1)*(x-1)^2*(1+x)^2 ). - R. J. Mathar, May 22 2013 MATHEMATICA LinearRecurrence[{1, 3, -2, -3, 1, 1}, {1, 13, 41, 90, 185, 335}, 30] (* Harvey P. Dale, Jan 08 2015 *) CROSSREFS Sequence in context: A045473 A102083 A139866 * A123972 A167585 A141970 Adjacent sequences: A026915 A026916 A026917 * A026919 A026920 A026921 KEYWORD nonn AUTHOR Clark Kimberling STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified March 5 08:56 EST 2024. Contains 370538 sequences. (Running on oeis4.)