Number of zig-zag paths from top to bottom of a rectangle of width 11 with n rows whose color is that of the top right corner.

A153369

Number of zig-zag paths from top to bottom of a rectangle of width 11 with n rows whose color is that of the top right corner.

Terms

    a(0) =6a(1) =10a(2) =20a(3) =36a(4) =72a(5) =132a(6) =264a(7) =488a(8) =976a(9) =1812a(10) =3624a(11) =6744a(12) =13488a(13) =25132a(14) =50264a(15) =93720a(16) =187440a(17) =349620a(18) =699240a(19) =1304504a(20) =2609008a(21) =4867884a(22) =9735768a(23) =18166008a(24) =36332016a(25) =67794100a(26) =135588200a(27) =253006296a(28) =506012592a(29) =944222892

External references