Tetranacci numbers: a(n) = a(n-1) + a(n-2) + a(n-3) + a(n-4) for n >= 4 with a(0) = a(1) = a(2) = 0 and a(3) = 1.

A000078

Tetranacci numbers: a(n) = a(n-1) + a(n-2) + a(n-3) + a(n-4) for n >= 4 with a(0) = a(1) = a(2) = 0 and a(3) = 1.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =1a(4) =1a(5) =2a(6) =4a(7) =8a(8) =15a(9) =29a(10) =56a(11) =108a(12) =208a(13) =401a(14) =773a(15) =1490a(16) =2872a(17) =5536a(18) =10671a(19) =20569a(20) =39648a(21) =76424a(22) =147312a(23) =283953a(24) =547337a(25) =1055026a(26) =2033628a(27) =3919944a(28) =7555935a(29) =14564533

External references