Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010001 00010101 or 01010101.

A261107

Number of (n+2) X (2+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010001 00010101 or 01010101.

Terms

    a(0) =33a(1) =52a(2) =106a(3) =206a(4) =402a(5) =790a(6) =1546a(7) =3026a(8) =5928a(9) =11610a(10) =22736a(11) =44526a(12) =87200a(13) =170774a(14) =334446a(15) =654980a(16) =1282716a(17) =2512082a(18) =4919682a(19) =9634740a(20) =18868742a(21) =36952682a(22) =72368406a(23) =141726816a(24) =277558826a(25) =543573226a(26) =1064537776a(27) =2084798554a(28) =4082884696

External references