Number of nX7 0..1 arrays with every element unequal to 0, 1, 3, 4 or 8 king-move adjacent elements, with upper left element zero.
A305251
Number of nX7 0..1 arrays with every element unequal to 0, 1, 3, 4 or 8 king-move adjacent elements, with upper left element zero.
Terms
- a(0) =21a(1) =127a(2) =121a(3) =356a(4) =1010a(5) =2985a(6) =9288a(7) =29714a(8) =94491a(9) =302488a(10) =974340a(11) =3152830a(12) =10230396a(13) =33285406a(14) =108488648a(15) =354109540a(16) =1157319070a(17) =3786080477a(18) =12395839066a(19) =40611746091a(20) =133123022408a(21) =436560165995
External references
- oeis: A305251