a(n) = a(n-1) + a(n-7), with a(i) = 1 for i = 0..6.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =2a(8) =3a(9) =4a(10) =5a(11) =6a(12) =7a(13) =8a(14) =10a(15) =13a(16) =17a(17) =22a(18) =28a(19) =35a(20) =43a(21) =53a(22) =66a(23) =83a(24) =105a(25) =133a(26) =168a(27) =211a(28) =264a(29) =330