Boustrophedon transform of Hamming weight (A000120).

Terms

a(0) =0a(1) =1a(2) =3a(3) =8a(4) =23a(5) =72a(6) =280a(7) =1242a(8) =6331a(9) =36236a(10) =230726a(11) =1615584a(12) =12342422a(13) =102145644a(14) =910393530a(15) =8693609421a(16) =88552405435a(17) =958361506524