Number of n X 3 0..1 arrays with every element unequal to 0, 1, 2, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

A317606

Number of n X 3 0..1 arrays with every element unequal to 0, 1, 2, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =14a(2) =38a(3) =109a(4) =419a(5) =1413a(6) =4708a(7) =16406a(8) =56424a(9) =192997a(10) =664256a(11) =2285461a(12) =7852493a(13) =26999600a(14) =92853653a(15) =319251681a(16) =1097719967a(17) =3774663142a(18) =12979283717a(19) =44629543176a(20) =153461588223a(21) =527686255393

External references