Number of 2 X n 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.
A230470
Number of 2 X n 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =36a(4) =216a(5) =1260a(6) =6912a(7) =38340a(8) =213192a(9) =1188252a(10) =6624720a(11) =36934452a(12) =205906968a(13) =1147892364a(14) =6399246240a(15) =35674383780a(16) =198876914280
External references
- oeis: A230470