If n <= 5 then a(n) = 1, if 6 <= n <= 8 then 2, if n = 9 or 10 then 3, if n = 11, 12 or 13 then n-7; otherwise a(n) = 2*a(n - 4) + a(n - 12).
A239905
If n <= 5 then a(n) = 1, if 6 <= n <= 8 then 2, if n = 9 or 10 then 3, if n = 11, 12 or 13 then n-7; otherwise a(n) = 2*a(n - 4) + a(n - 12).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =2a(7) =2a(8) =3a(9) =3a(10) =4a(11) =5a(12) =6a(13) =7a(14) =9a(15) =11a(16) =13a(17) =16a(18) =20a(19) =24a(20) =29a(21) =35a(22) =44a(23) =53a(24) =64a(25) =77a(26) =97a(27) =117a(28) =141a(29) =170
External references
- oeis: A239905