Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010101 or 01010101.

A259735

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010101 or 01010101.

Terms

    a(0) =20a(1) =22a(2) =42a(3) =62a(4) =101a(5) =152a(6) =265a(7) =382a(8) =652a(9) =962a(10) =1649a(11) =2412a(12) =4135a(13) =6062a(14) =10386a(15) =15222a(16) =26089a(17) =38232a(18) =65517a(19) =96022a(20) =164556a(21) =241162a(22) =413285a(23) =605692a(24) =1037987a(25) =1521222a(26) =2606954a(27) =3820622a(28) =6547485a(29) =9595672

External references