Number of nX2 0..1 arrays with every element unequal to 0, 1 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A317767
Number of nX2 0..1 arrays with every element unequal to 0, 1 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =2a(1) =3a(2) =4a(3) =7a(4) =11a(5) =18a(6) =30a(7) =49a(8) =81a(9) =134a(10) =221a(11) =365a(12) =603a(13) =996a(14) =1645a(15) =2717a(16) =4488a(17) =7413a(18) =12244a(19) =20224a(20) =33405a(21) =55176a(22) =91136a(23) =150533a(24) =248641a(25) =410689a(26) =678350a(27) =1120456a(28) =1850698a(29) =3056865
External references
- oeis: A317767