Number of subsets of {1,2,3,...,n} that sum to 0 mod 19.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =7a(8) =14a(9) =27a(10) =54a(11) =108a(12) =216a(13) =431a(14) =862a(15) =1724a(16) =3450a(17) =6899a(18) =13798a(19) =27596a(20) =55190a(21) =110378a(22) =220754a(23) =441506a(24) =883010a(25) =1766020a(26) =3532046a(27) =7064092a(28) =14128182a(29) =28256364