Number of (n+1) X 2 binary arrays with every 2 X 2 subblock commuting with each of its horizontal and vertical 2 X 2 subblock neighbors.

A186454

Number of (n+1) X 2 binary arrays with every 2 X 2 subblock commuting with each of its horizontal and vertical 2 X 2 subblock neighbors.

Terms

    a(0) =16a(1) =21a(2) =42a(3) =61a(4) =106a(5) =151a(6) =245a(7) =359a(8) =567a(9) =840a(10) =1301a(11) =1941a(12) =2977a(13) =4465a(14) =6810a(15) =10247a(16) =15577a(17) =23487a(18) =35635a(19) =53800a(20) =81533a(21) =123193a(22) =186569a(23) =282037a(24) =426954a(25) =645623a(26) =977117a(27) =1477831a(28) =2236287a(29) =3382632

External references