Number of (n+3)X(2+3) 0..3 black square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero.
A231020
Number of (n+3)X(2+3) 0..3 black square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero.
Terms
- a(0) =16a(1) =242a(2) =724a(3) =10534a(4) =28128a(5) =419878a(6) =1144652a(7) =16946918a(8) =46058744a(9) =683352174a(10) =1857863476a(11) =27552792942a(12) =74908095984
External references
- oeis: A231020