Number of nX4 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 0 and 0 1 1 vertically.

A207904

Number of nX4 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 0 and 0 1 1 vertically.

Terms

    a(0) =9a(1) =81a(2) =289a(3) =841a(4) =2209a(5) =5041a(6) =11025a(7) =22801a(8) =45369a(9) =88209a(10) =167281a(11) =312481a(12) =576081a(13) =1050625a(14) =1901641a(15) =3418801a(16) =6115729a(17) =10896601a(18) =19351201a(19) =34281025a(20) =60606225a(21) =106977649a(22) =188595289a(23) =332150625a(24) =584527329a(25) =1028035969a(26) =1807185121

External references