Number of nX3 0..2 black square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value 2-x(i,j).
A230658
Number of nX3 0..2 black square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value 2-x(i,j).
Terms
- a(0) =0a(1) =3a(2) =15a(3) =21a(4) =135a(5) =177a(6) =1155a(7) =1509a(8) =9855a(9) =12873a(10) =84075a(11) =109821a(12) =717255a(13) =936897a(14) =6118995a(15) =7992789a(16) =52201935a(17) =68187513a(18) =445341435a(19) =581716461a(20) =3799265175a(21) =4962698097a(22) =32412020835a(23) =42337417029a(24) =276511126815a(25) =361185960873
External references
- oeis: A230658