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

A083839

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

Terms

    a(0) =0a(1) =1a(2) =1a(3) =4a(4) =7a(5) =11a(6) =19a(7) =36a(8) =67a(9) =121a(10) =216a(11) =386a(12) =691a(13) =1236a(14) =2206a(15) =3929a(16) =6987a(17) =12411a(18) =22024a(19) =39046a(20) =69162a(21) =122406a(22) =216481a(23) =382606a(24) =675811a(25) =1193061a(26) =2105156a(27) =3712864a(28) =6545672a(29) =11535476

External references