Number of n X 2 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 1 or 3 neighboring 1's.

A296390

Number of n X 2 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 1 or 3 neighboring 1's.

Terms

    a(0) =2a(1) =6a(2) =11a(3) =28a(4) =63a(5) =139a(6) =328a(7) =735a(8) =1684a(9) =3853a(10) =8750a(11) =20021a(12) =45627a(13) =104068a(14) =237541a(15) =541649a(16) =1235897a(17) =2819380a(18) =6431345a(19) =14672588a(20) =33470945a(21) =76356833a(22) =174191649a(23) =397374570a(24) =906523725a(25) =2068021039a(26) =4717711395a(27) =10762383681a(28) =24551876711

External references