OFFSET
1,1
LINKS
Eric Weisstein's World of Mathematics, Edge Cut.
Eric Weisstein's World of Mathematics, Necklace Graph.
Index entries for linear recurrences with constant coefficients, signature (92,-1988,12544).
FORMULA
a(n) = 64^n - (24*n + 14)*14^(n-1). - Andrew Howroyd, Feb 12 2026
G.f.: -2*x*(13+418*x)/((1-14*x)^2*(-1+64*x)). - Eric W. Weisstein, Feb 13 2026
a(n) = 92*a(n-1)-1988*a(n-2)+12544*a(n-3). - Eric W. Weisstein, Feb 13 2026
MATHEMATICA
Table[64^n - 14^n (12 n + 7)/7, {n, 20}]
LinearRecurrence[{92, -1988, 12544}, {26, 3228, 245288}, 20]
CoefficientList[Series[-2 (13 + 418 x)/((1 - 14 x)^2 (-1 + 64 x)), {x, 0, 20}], x]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Eric W. Weisstein, Feb 12 2026
EXTENSIONS
a(4) onward from Andrew Howroyd, Feb 12 2026
STATUS
approved
