Number of nX6 0..1 arrays with every element equal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A300433

Number of nX6 0..1 arrays with every element equal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =5a(1) =90a(2) =228a(3) =697a(4) =2104a(5) =6677a(6) =21891a(7) =68080a(8) =218474a(9) =707211a(10) =2281943a(11) =7421447a(12) =24244635a(13) =79613441a(14) =262305791a(15) =866922952a(16) =2874086666a(17) =9549579356a(18) =31785844580a(19) =105953201430a(20) =353610758665

External references