Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00010101.

A260468

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00010101.

Terms

    a(0) =34a(1) =49a(2) =103a(3) =205a(4) =414a(5) =840a(6) =1716a(7) =3477a(8) =7049a(9) =14293a(10) =29064a(11) =58992a(12) =119714a(13) =243113a(14) =493739a(15) =1002385a(16) =2035086a(17) =4131940a(18) =8389884a(19) =17034549a(20) =34585457a(21) =70222293a(22) =142579896a(23) =289489424a(24) =587771042a(25) =1193399465a(26) =2423058571a(27) =4919726081

External references