1/8 the number of (n+1)X2 0..3 arrays with all 2X2 subblock sums the same.

A184021

1/8 the number of (n+1)X2 0..3 arrays with all 2X2 subblock sums the same.

Terms

    a(0) =32a(1) =88a(2) =242a(3) =748a(4) =2312a(5) =7684a(6) =25538a(7) =89044a(8) =310472a(9) =1119748a(10) =4038482a(11) =14931868a(12) =55209032a(13) =207984844a(14) =783525698a(15) =2994047524a(16) =11441003912a(17) =44197635508a(18) =170739473522a(19) =665105634988

External references