Number of zig-zag paths from top to bottom of a rectangle of width 11 with n rows whose color is not that of the top right corner.

A153370

Number of zig-zag paths from top to bottom of a rectangle of width 11 with n rows whose color is not that of the top right corner.

Terms

    a(0) =5a(1) =10a(2) =18a(3) =36a(4) =66a(5) =132a(6) =244a(7) =488a(8) =906a(9) =1812a(10) =3372a(11) =6744a(12) =12566a(13) =25132a(14) =46860a(15) =93720a(16) =174810a(17) =349620a(18) =652252a(19) =1304504a(20) =2433942a(21) =4867884a(22) =9083004a(23) =18166008a(24) =33897050a(25) =67794100a(26) =126503148a(27) =253006296a(28) =472111446a(29) =944222892

External references