Number of (n+1) X (1+1) 0..1 arrays with each 2 X 2 subblock having clockwise pattern 0000 0001 0101 0111.

A259508

Number of (n+1) X (1+1) 0..1 arrays with each 2 X 2 subblock having clockwise pattern 0000 0001 0101 0111.

Terms

    a(0) =11a(1) =31a(2) =87a(3) =245a(4) =689a(5) =1939a(6) =5455a(7) =15349a(8) =43185a(9) =121507a(10) =341871a(11) =961893a(12) =2706385a(13) =7614707a(14) =21424783a(15) =60280917a(16) =169606769a(17) =477206723a(18) =1342671919a(19) =3777750469a(20) =10629103249a(21) =29906114067a(22) =84144036943a(23) =236748209589a(24) =666116301873

External references