Half the number of (n+1) X 2 0..3 arrays with every 2 X 2 subblock diagonal sum differing from its antidiagonal sum by more than 3.
A184223
Half the number of (n+1) X 2 0..3 arrays with every 2 X 2 subblock diagonal sum differing from its antidiagonal sum by more than 3.
Terms
- a(0) =15a(1) =57a(2) =180a(3) =621a(4) =2061a(5) =6966a(6) =23355a(7) =78597a(8) =264060a(9) =887841a(10) =2984121a(11) =10031526a(12) =33719895a(13) =113349537a(14) =381019140a(15) =1280786661a(16) =4305320181a(17) =14472205686a(18) =48647857635a(19) =163528268877a(20) =549695145420
External references
- oeis: A184223