Number of (n+1)X3 0..3 arrays with rows and columns in nondecreasing order and with no 2X2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one.
A184088
Number of (n+1)X3 0..3 arrays with rows and columns in nondecreasing order and with no 2X2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one.
Terms
- a(0) =216a(1) =260a(2) =1146a(3) =2848a(4) =9945a(5) =28434a(6) =87119a(7) =254174a(8) =732978a(9) =2062353a(10) =5663089a(11) =15156140a(12) =39373663a(13) =99199976a(14) =241889509a(15) =570721800a(16) =1303028175a(17) =2880190406a(18) =6168364480a(19) =12813006924a(20) =25845550887a(21) =50691467373a(22) =96800121980a(23) =180213143357
External references
- oeis: A184088