Pisot sequence E(4,15): a(n) = floor(a(n-1)^2/a(n-2)+1/2) for n>1, a(0)=4, a(1)=15.

A010905

Pisot sequence E(4,15): a(n) = floor(a(n-1)^2/a(n-2)+1/2) for n>1, a(0)=4, a(1)=15.

Terms

    a(0) =4a(1) =15a(2) =56a(3) =209a(4) =780a(5) =2911a(6) =10864a(7) =40545a(8) =151316a(9) =564719a(10) =2107560a(11) =7865521a(12) =29354524a(13) =109552575a(14) =408855776a(15) =1525870529a(16) =5694626340a(17) =21252634831a(18) =79315912984a(19) =296011017105

External references