Number of nX3 0..1 arrays with every element equal to 0, 1, 3, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A300939

Number of nX3 0..1 arrays with every element equal to 0, 1, 3, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =3a(1) =2a(2) =5a(3) =12a(4) =19a(5) =47a(6) =101a(7) =206a(8) =411a(9) =882a(10) =1851a(11) =3845a(12) =7965a(13) =16694a(14) =34883a(15) =72716a(16) =151521a(17) =316419a(18) =660399a(19) =1377674a(20) =2873815a(21) =5997158a(22) =12513837a(23) =26109233a(24) =54474709a(25) =113665030a(26) =237165643a(27) =494844028a(28) =1032487175a(29) =2154302515

External references