Number of nonempty subsets S of {1,2,3,...,n} that have the property that no element x of S is a nonnegative integer linear combination of elements of S-{x}.
A103580
Number of nonempty subsets S of {1,2,3,...,n} that have the property that no element x of S is a nonnegative integer linear combination of elements of S-{x}.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =6a(4) =11a(5) =15a(6) =26a(7) =36a(8) =57a(9) =79a(10) =130a(11) =170a(12) =276a(13) =379a(14) =579a(15) =784a(16) =1249a(17) =1654a(18) =2615a(19) =3515a(20) =5343a(21) =7256a(22) =11352a(23) =14930a(24) =23203a(25) =31378a(26) =47510a(27) =63777a(28) =98680a(29) =130502
External references
- oeis: A103580