Number of nX4 0..1 arrays with every element equal to 0, 1 or 4 horizontally or vertically adjacent elements, with upper left element zero.

A301658

Number of nX4 0..1 arrays with every element equal to 0, 1 or 4 horizontally or vertically adjacent elements, with upper left element zero.

Terms

    a(0) =5a(1) =6a(2) =9a(3) =13a(4) =24a(5) =45a(6) =89a(7) =182a(8) =373a(9) =773a(10) =1604a(11) =3333a(12) =6933a(13) =14422a(14) =30009a(15) =62445a(16) =129944a(17) =270413a(18) =562729a(19) =1171046a(20) =2436965a(21) =5071365a(22) =10553604a(23) =21962245a(24) =45703845a(25) =95110566a(26) =197926889a(27) =411889613a(28) =857150104a(29) =1783745645

External references