Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 01010101 or 01010111.

A260134

Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00010101 01010101 or 01010111.

Terms

    a(0) =266a(1) =730a(2) =2966a(3) =8292a(4) =24696a(5) =85048a(6) =266156a(7) =813540a(8) =2626092a(9) =8360396a(10) =26119048a(11) =82814452a(12) =263115624a(13) =829520604a(14) =2621823280a(15) =8306855180a(16) =26259682284a(17) =83003335876a(18) =262648203728a(19) =830734849888

External references