Number of nX2 0..3 arrays with no more than floor(nX2/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.
A222373
Number of nX2 0..3 arrays with no more than floor(nX2/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =18a(4) =63a(5) =234a(6) =1163a(7) =4953a(8) =24021a(9) =109395a(10) =536457a(11) =2526558a(12) =12324313a(13) =59135699a(14) =288057673a(15) =1396084937a(16) =6800380165a(17) =33152287976a(18) =161670473265a(19) =790996243845
External references
- oeis: A222373