Number of 3 X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically.

A207600

Number of 3 X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically.

Terms

    a(0) =6a(1) =36a(2) =90a(3) =225a(4) =825a(5) =3025a(6) =9240a(7) =28224a(8) =93912a(9) =312481a(10) =997815a(11) =3186225a(12) =10377990a(13) =33802596a(14) =109041570a(15) =351750025a(16) =1140060185a(17) =3695059369a(18) =11948292720a(19) =38635833600a(20) =125075648880a(21) =404906960329

External references