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

A303963

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

Terms

    a(0) =2a(1) =5a(2) =9a(3) =21a(4) =53a(5) =105a(6) =237a(7) =577a(8) =1205a(9) =2681a(10) =6349a(11) =13681a(12) =30309a(13) =70377a(14) =154429a(15) =342177a(16) =783957a(17) =1737881a(18) =3857581a(19) =8760529a(20) =19527749a(21) =43436873a(22) =98090781a(23) =219270657a(24) =488654645a(25) =1099633401a(26) =2461435533a(27) =5493590065a(28) =12336038693a(29) =27628989353

External references