Number of (n+3) X (1+3) 0..3 white 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.
A230942
Number of (n+3) X (1+3) 0..3 white 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) =6a(1) =16a(2) =76a(3) =314a(4) =1170a(5) =4584a(6) =18208a(7) =71242a(8) =278758a(9) =1094600a(10) =4294812a(11) =16840082a(12) =66052162a(13) =259099696a(14) =1016260448a(15) =3986056882a(16) =15634778470a(17) =61325029216a(18) =240537044748a(19) =943467829258
External references
- oeis: A230942