Number of subsets of {1,2,3,...,n} that sum to 0 mod 12.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =6a(7) =11a(8) =22a(9) =44a(10) =86a(11) =172a(12) =344a(13) =684a(14) =1368a(15) =2736a(16) =5464a(17) =10928a(18) =21856a(19) =43696a(20) =87392a(21) =174784a(22) =349536a(23) =699072a(24) =1398144a(25) =2796224a(26) =5592448a(27) =11184896a(28) =22369664a(29) =44739328