Number of distinct squares D(n) in the n-th iterate of the tribonacci morphism (a -> ab, b -> ac, c -> a) on the letter a.

A116576

Number of distinct squares D(n) in the n-th iterate of the tribonacci morphism (a -> ab, b -> ac, c -> a) on the letter a.

Terms

    a(0) =2a(1) =7a(2) =17a(3) =35a(4) =69a(5) =132a(6) =248a(7) =462a(8) =856a(9) =1581a(10) =2915a(11) =5369a(12) =9883a(13) =18186a(14) =33458a(15) =61548a(16) =113214a(17) =208243a(18) =383029a(19) =704511a(20) =1295809a(21) =2383376a(22) =4383724a(23) =8062938a(24) =14830068a(25) =27276761a(26) =50169799a(27) =92276661a(28) =169723255a(29) =312169750

External references