a(1)=a(2)=1; thereafter, a(n+1) = a(n) + a(n-1) + 1 if n is a multiple of 5, otherwise a(n+1) = a(n) + a(n-1).

A124502

a(1)=a(2)=1; thereafter, a(n+1) = a(n) + a(n-1) + 1 if n is a multiple of 5, otherwise a(n+1) = a(n) + a(n-1).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =9a(6) =14a(7) =23a(8) =37a(9) =60a(10) =98a(11) =158a(12) =256a(13) =414a(14) =670a(15) =1085a(16) =1755a(17) =2840a(18) =4595a(19) =7435a(20) =12031a(21) =19466a(22) =31497a(23) =50963a(24) =82460a(25) =133424a(26) =215884a(27) =349308a(28) =565192a(29) =914500

External references