a(n) = F(4)*F(n)*F(n+1) + F(5)*F(n+1)^2 if n odd, a(n) = F(4)*F(n)*F(n+1) + F(5)*F(n+1)^2 - F(5) if n even, where F(n) is the n-th Fibonacci number (A000045).

A080144

a(n) = F(4)*F(n)*F(n+1) + F(5)*F(n+1)^2 if n odd, a(n) = F(4)*F(n)*F(n+1) + F(5)*F(n+1)^2 - F(5) if n even, where F(n) is the n-th Fibonacci number (A000045).

Terms

    a(0) =0a(1) =8a(2) =21a(3) =63a(4) =165a(5) =440a(6) =1152a(7) =3024a(8) =7917a(9) =20735a(10) =54285a(11) =142128a(12) =372096a(13) =974168a(14) =2550405a(15) =6677055a(16) =17480757a(17) =45765224a(18) =119814912a(19) =313679520a(20) =821223645a(21) =2149991423a(22) =5628750621a(23) =14736260448a(24) =38580030720a(25) =101003831720

External references