Number of (n+2) X (4+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001001.

A260244

Number of (n+2) X (4+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001001.

Terms

    a(0) =635a(1) =1235a(2) =3287a(3) =5733a(4) =14045a(5) =42143a(6) =85491a(7) =178543a(8) =492457a(9) =1191315a(10) =2445353a(11) =5956161a(12) =15293067a(13) =33742487a(14) =75896973a(15) =191097599a(16) =450742619a(17) =1002739961a(18) =2404247583a(19) =5842913003a(20) =13329225455a(21) =30884432185a(22) =74706438775a(23) =175270605465

External references