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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A026155 T(n,n-4), where T is the array in A026148. 0
 1, 4, 16, 56, 189, 616, 1967, 6182, 19205, 59124, 180726, 549276, 1661646, 5007520, 15042722, 45068836, 134727499, 401991436, 1197519631, 3562523314, 10585937404, 31424706800, 93206486620, 276253350360, 818278951035, 2422518642516 (list; graph; refs; listen; history; text; internal format)
 OFFSET 4,2 LINKS Table of n, a(n) for n=4..29. FORMULA Conjectures from Chai Wah Wu, Mar 23 2020: (Start) a(n) = 12*a(n-1) - 53*a(n-2) + 90*a(n-3) + 26*a(n-4) - 256*a(n-5) + 160*a(n-6) + 224*a(n-7) - 203*a(n-8) - 84*a(n-9) + 77*a(n-10) + 14*a(n-11) - 7*a(n-12) for n > 15. G.f.: x^4*(x - 1)^2*(x^6 - 6*x^5 - 13*x^4 + 8*x^3 + 8*x^2 - 6*x + 1)/((7*x^6 + 7*x^5 - 21*x^4 + 14*x^2 - 7*x + 1)*(x^6 - 3*x^5 - 5*x^4 + 8*x^3 + 4*x^2 - 5*x + 1)). (End) CROSSREFS First differences of A026329. Sequence in context: A073388 A109634 A026126 * A025182 A057585 A333107 Adjacent sequences: A026152 A026153 A026154 * A026156 A026157 A026158 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 August 12 03:07 EDT 2024. Contains 375085 sequences. (Running on oeis4.)