0,5

Charles Gely, "Lapins imaginaires et valeurs propres". Quadrature Quarterly #30.

a(n)=2*a(n-1)-a(n-2)-a(n-4); G.f.: (2*x-1)*(x-1)/(x^4+x^2-2*x+1); second differences give {-a(n-2)}.

Sequence in context: A145668 A129104 A092450 this_sequence A136587 A136247 A086610

Adjacent sequences: A014288 A014289 A014290 this_sequence A014292 A014293 A014294

sign

Olivier Gerard (olivier.gerard(AT)gmail.com)