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

A296399

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

Terms

    a(0) =1a(1) =4a(2) =8a(3) =17a(4) =46a(5) =114a(6) =289a(7) =757a(8) =1964a(9) =5118a(10) =13391a(11) =35008a(12) =91589a(13) =239740a(14) =627506a(15) =1642656a(16) =4300361a(17) =11258087a(18) =29473546a(19) =77162161a(20) =202011991a(21) =528872756a(22) =1384604934a(23) =3624939359a(24) =9490209947a(25) =24845686106a(26) =65046840605a(27) =170294825972

External references