Number of nX4 0..1 arrays with every element equal to 0 or 1 horizontally or antidiagonally adjacent elements, with upper left element zero.

A301786

Number of nX4 0..1 arrays with every element equal to 0 or 1 horizontally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =5a(1) =9a(2) =17a(3) =32a(4) =61a(5) =116a(6) =221a(7) =421a(8) =802a(9) =1528a(10) =2911a(11) =5546a(12) =10566a(13) =20130a(14) =38351a(15) =73065a(16) =139201a(17) =265201a(18) =505252a(19) =962589a(20) =1833892a(21) =3493869a(22) =6656401a(23) =12681550a(24) =24160460a(25) =46029691a(26) =87694210a(27) =167072042a(28) =318300002a(29) =606414395

External references