Number of subsets of {1,2,...,n-8} without differences equal to 2, 4, 6 or 8.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =2a(10) =4a(11) =6a(12) =9a(13) =12a(14) =16a(15) =20a(16) =25a(17) =30a(18) =36a(19) =48a(20) =64a(21) =88a(22) =121a(23) =165a(24) =225a(25) =300a(26) =400a(27) =520a(28) =676a(29) =884