Number of subsets of {1,2,...,n} such that no two elements differ by 1, 3, 4, or 5.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =9a(6) =11a(7) =14a(8) =18a(9) =25a(10) =35a(11) =49a(12) =67a(13) =90a(14) =119a(15) =158a(16) =211a(17) =285a(18) =387a(19) =526a(20) =712a(21) =960a(22) =1290a(23) =1733a(24) =2331a(25) =3142a(26) =4241a(27) =5727a(28) =7729a(29) =10422