Number of nX2 0..1 arrays with every element unequal to 0, 1, 3, 4 or 5 king-move adjacent elements, with upper left element zero.

A304349

Number of nX2 0..1 arrays with every element unequal to 0, 1, 3, 4 or 5 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =2a(1) =5a(2) =9a(3) =21a(4) =57a(5) =125a(6) =289a(7) =741a(8) =1737a(9) =4045a(10) =9969a(11) =23861a(12) =56217a(13) =135965a(14) =326849a(15) =776581a(16) =1864297a(17) =4479085a(18) =10691729a(19) =25606101a(20) =61438777a(21) =146972605a(22) =351821409a(23) =843331621a(24) =2019112457a(25) =4833683725a(26) =11580336689a(27) =27733236341a(28) =66402706137

External references