A131870 - OEIS

A131870

Period 8: repeat [1, 2, 3, 4, 6, 7, 8, 9].

1, 2, 3, 4, 6, 7, 8, 9, 1, 2, 3, 4, 6, 7, 8, 9, 1, 2, 3, 4, 6, 7, 8, 9, 1, 2, 3, 4, 6, 7, 8, 9, 1, 2, 3, 4, 6, 7, 8, 9, 1, 2, 3, 4, 6, 7, 8, 9, 1, 2, 3, 4, 6, 7, 8, 9, 1, 2, 3, 4, 6, 7, 8, 9, 1, 2, 3, 4, 6, 7, 8, 9, 1, 2, 3, 4, 6, 7, 8, 9, 1, 2, 3, 4, 6, 7, 8, 9, 1, 2, 3, 4, 6, 7, 8, 9, 1, 2, 3, 4, 6, 7, 8, 9, 1

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..104.

Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,0,0,1).

FORMULA

From Wesley Ivan Hurt, Aug 31 2019: (Start)

G.f.: (1 + 2*x + 3*x^2 + 4*x^3 + 6*x^4 + 7*x^5 + 8*x^6 + 9*x^7)/(1-x^8).

a(n) = (1+(n mod 4))*(1+(-1)^floor(n/4))/2 + (6+((n-4) mod 4))*(1+(-1)^floor((n-4)/4))/2.

(End)

MATHEMATICA