Number of non-colorable strings of length n considered by the alternating coloring function.

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =4a(5) =8a(6) =12a(7) =24a(8) =44a(9) =88a(10) =172a(11) =344a(12) =684a(13) =1368a(14) =2732a(15) =5464a(16) =10924a(17) =21848a(18) =43692a(19) =87384a(20) =174764a(21) =349528a(22) =699052a(23) =1398104a(24) =2796204a(25) =5592408a(26) =11184812a(27) =22369624a(28) =44739244a(29) =89478488