Number of (n+3) X (1+3) 0..2 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 3, and upper left element zero.
A230701
Number of (n+3) X (1+3) 0..2 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 3, and upper left element zero.
Terms
- a(0) =2a(1) =8a(2) =30a(3) =102a(4) =348a(5) =1172a(6) =3956a(7) =13326a(8) =44916a(9) =151338a(10) =509978a(11) =1718408a(12) =5790456a(13) =19511640a(14) =65747178a(15) =221543696a(16) =746521190a(17) =2515502046a(18) =8476319172a(19) =28562083692a(20) =96243740012a(21) =324306077270
External references
- oeis: A230701