OFFSET
0,2
FORMULA
a(n) = a(n-1) + Mod[n,4] + 1; a(0)=0.
From Chai Wah Wu, Mar 07 2018: (Start)
a(n) = a(n-1) + a(n-4) - a(n-5) for n > 4.
G.f.: x*(x^3 + 4*x^2 + 3*x + 2)/(x^5 - x^4 - x + 1). (End)
MATHEMATICA
digits=200 f[n_]:=f[n]=f[n-1]+Mod[n, 4]+1 f[0]=0; a=Table[f[n], {n, 1, digits}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Roger L. Bagula, Nov 24 2004
EXTENSIONS
Better name from Ralf Stephan, May 15 2007
STATUS
approved