OFFSET
2,2
REFERENCES
Nicholas S. Horne, Analysis of Viable Network Configurations from a Combinatorial, Graphical and Algebraic Perspective, Diss. Providence College, 2004.
LINKS
Index entries for linear recurrences with constant coefficients, signature (7,-21,35,-35,21,-7,1).
FORMULA
a(n) = (n + 1)*n*(n - 1)*(n^3 + 3*n^2 + 2*n - 16)/48. - corrected by Eric Rowland, Aug 15 2017
G.f.: x^2*(2*x^3-3*x^2+15*x+1)/(1-x)^7. - Colin Barker, Nov 24 2012
a(n) = 7*a(n-1) - 21*a(n-2) + 35*a(n-3) - 35*a(n-4) + 21*a(n-5) - 7*a(n-6) + a(n-7). - Wesley Ivan Hurt, Apr 12 2023
MATHEMATICA
LinearRecurrence[{7, -21, 35, -35, 21, -7, 1}, {1, 22, 130, 485, 1400, 3416, 7392}, 30] (* Harvey P. Dale, Jul 10 2021 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Nicholas S. Horne (nickhorne(AT)cox.net), Jul 06 2004
STATUS
approved