Number of (n+1)X2 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.
A184087
Number of (n+1)X2 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) =86a(1) =216a(2) =684a(3) =1714a(4) =4434a(5) =10610a(6) =24754a(7) =55451a(8) =120398a(9) =253258a(10) =517352a(11) =1027629a(12) =1987737a(13) =3749525a(14) =6907155a(15) =12442630a(16) =21946647a(17) =37947805a(18) =64395228a(19) =107355159a(20) =176001834a(21) =284007825a(22) =451470045a(23) =707545860a(24) =1094020513a(25) =1670083737
External references
- oeis: A184087