Number of nX3 0..1 arrays with every element equal to 0, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.

A301603

Number of nX3 0..1 arrays with every element equal to 0, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =2a(2) =2a(3) =8a(4) =13a(5) =26a(6) =55a(7) =154a(8) =356a(9) =884a(10) =2161a(11) =5440a(12) =13511a(13) =33780a(14) =84398a(15) =211338a(16) =528999a(17) =1325014a(18) =3319005a(19) =8315948a(20) =20836784a(21) =52214530a(22) =130847203a(23) =327910100a(24) =821772985a(25) =2059471558a(26) =5161348174a(27) =12935209836a(28) =32417941793a(29) =81245379630

External references