Number of nX3 0..2 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value 2-x(i,j).
A230647
Number of nX3 0..2 white 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) =3a(3) =21a(4) =27a(5) =177a(6) =231a(7) =1509a(8) =1971a(9) =12873a(10) =16815a(11) =109821a(12) =143451a(13) =936897a(14) =1223799a(15) =7992789a(16) =10440387a(17) =68187513a(18) =89068287a(19) =581716461a(20) =759853035a(21) =4962698097a(22) =6482404167a(23) =42337417029a(24) =55302225363a(25) =361185960873a(26) =471790411599
External references
- oeis: A230647