Number of nX3 0..1 arrays with each 1 horizontally or vertically adjacent to 1 or 3 1s.

A295092

Number of nX3 0..1 arrays with each 1 horizontally or vertically adjacent to 1 or 3 1s.

Terms

    a(0) =3a(1) =11a(2) =33a(3) =114a(4) =377a(5) =1249a(6) =4151a(7) =13765a(8) =45704a(9) =151720a(10) =503627a(11) =1671816a(12) =5549529a(13) =18421629a(14) =61150537a(15) =202988906a(16) =673820905a(17) =2236745220a(18) =7424865048a(19) =24646804474a(20) =81814951110a(21) =271584345815a(22) =901522957697

External references