Number of (n+1) X (2+1) 0..1 arrays with every 2 X 2 subblock having a single 1 or two 1s on the same edge or main diagonally.
A251286
Number of (n+1) X (2+1) 0..1 arrays with every 2 X 2 subblock having a single 1 or two 1s on the same edge or main diagonally.
Terms
- a(0) =22a(1) =71a(2) =219a(3) =701a(4) =2193a(5) =6980a(6) =21966a(7) =69681a(8) =219860a(9) =696284a(10) =2199557a(11) =6960357a(12) =21999804a(13) =69591126a(14) =220014756a(15) =695843558a(16) =2200194145a(17) =6958021138a(18) =22001843859a(19) =69577286765a(20) =220014836192a(21) =695749296057
External references
- oeis: A251286