Number of nX5 0..1 arrays with every element equal to 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A300347

Number of nX5 0..1 arrays with every element equal to 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =3a(1) =37a(2) =57a(3) =152a(4) =306a(5) =729a(6) =1496a(7) =3223a(8) =6893a(9) =14847a(10) =31957a(11) =68842a(12) =148439a(13) =320256a(14) =691019a(15) =1491306a(16) =3218713a(17) =6947412a(18) =14996127a(19) =32370115a(20) =69873873a(21) =150830506a(22) =325586292a(23) =702821226a(24) =1517137602a(25) =3274960728a(26) =7069488750a(27) =15260562309

External references