Tetranacci numbers with different initial conditions: a(n) = a(n-1) + a(n-2) + a(n-3) + a(n-4) starting with a(0)=4, a(1)=1, a(2)=3, a(3)=7.

A073817

Tetranacci numbers with different initial conditions: a(n) = a(n-1) + a(n-2) + a(n-3) + a(n-4) starting with a(0)=4, a(1)=1, a(2)=3, a(3)=7.

Terms

    a(0) =4a(1) =1a(2) =3a(3) =7a(4) =15a(5) =26a(6) =51a(7) =99a(8) =191a(9) =367a(10) =708a(11) =1365a(12) =2631a(13) =5071a(14) =9775a(15) =18842a(16) =36319a(17) =70007a(18) =134943a(19) =260111a(20) =501380a(21) =966441a(22) =1862875a(23) =3590807a(24) =6921503a(25) =13341626a(26) =25716811a(27) =49570747a(28) =95550687a(29) =184179871

External references