Number of nX3 0..1 arrays with every element equal to 2, 3, 4, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A301395

Number of nX3 0..1 arrays with every element equal to 2, 3, 4, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =0a(1) =2a(2) =3a(3) =13a(4) =44a(5) =156a(6) =554a(7) =1963a(8) =6964a(9) =24699a(10) =87617a(11) =310815a(12) =1102602a(13) =3911438a(14) =13875683a(15) =49223528a(16) =174618908a(17) =619455124a(18) =2197497772a(19) =7795555028a(20) =27654489341a(21) =98103442446a(22) =348018917203

External references