Number of 3Xn 0..1 arrays with every element equal to 0, 1 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

A301965

Number of 3Xn 0..1 arrays with every element equal to 0, 1 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =13a(2) =16a(3) =25a(4) =41a(5) =74a(6) =132a(7) =239a(8) =437a(9) =800a(10) =1468a(11) =2697a(12) =4957a(13) =9114a(14) =16760a(15) =30823a(16) =56689a(17) =104264a(18) =191768a(19) =352713a(20) =648737a(21) =1193210a(22) =2194652a(23) =4036591a(24) =7424445a(25) =13655680a(26) =25116708a(27) =46196825a(28) =84969205a(29) =156282730

External references