Number of nX3 0..1 arrays with every element unequal to 0, 2, 3, 5 or 6 king-move adjacent elements, with upper left element zero.

A304671

Number of nX3 0..1 arrays with every element unequal to 0, 2, 3, 5 or 6 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =7a(2) =13a(3) =23a(4) =45a(5) =131a(6) =337a(7) =883a(8) =2389a(9) =6599a(10) =18393a(11) =51475a(12) =144777a(13) =408787a(14) =1156245a(15) =3275327a(16) =9287881a(17) =26355499a(18) =74822993a(19) =212488499a(20) =603573125a(21) =1714703255a(22) =4871817065a(23) =13842752035a(24) =39334524393a(25) =111773515363a(26) =317623880677

External references