Boustrophedon transform of all-1's sequence.

Terms

a(0) =1a(1) =2a(2) =4a(3) =9a(4) =24a(5) =77a(6) =294a(7) =1309a(8) =6664a(9) =38177a(10) =243034a(11) =1701909a(12) =13001604a(13) =107601977a(14) =959021574a(15) =9157981309a(16) =93282431344