Number of nX2 0..1 arrays with every element unequal to 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero.

A304052

Number of nX2 0..1 arrays with every element unequal to 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =3a(2) =11a(3) =10a(4) =51a(5) =165a(6) =306a(7) =993a(8) =2867a(9) =6818a(10) =19499a(11) =54021a(12) =139706a(13) =384617a(14) =1048819a(15) =2792250a(16) =7592483a(17) =20586021a(18) =55352322a(19) =149900145a(20) =405599347a(21) =1094294546a(22) =2959508123a(23) =8001948805a(24) =21614029834a(25) =58429173497a(26) =157940108211a(27) =426779942186

External references