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

A301902

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

Terms

    a(0) =1a(1) =2a(2) =3a(3) =7a(4) =16a(5) =43a(6) =117a(7) =330a(8) =935a(9) =2667a(10) =7616a(11) =21775a(12) =62273a(13) =178130a(14) =509563a(15) =1457727a(16) =4170224a(17) =11930147a(18) =34129757a(19) =97638522a(20) =279324735a(21) =799093699a(22) =2286051744a(23) =6539949991a(24) =18709526921a(25) =53524323778a(26) =153122698291a(27) =438054310967

External references