Number of nX4 0..1 arrays with every element unequal to 0, 1, 2 or 4 king-move adjacent elements, with upper left element zero.

A303796

Number of nX4 0..1 arrays with every element unequal to 0, 1, 2 or 4 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =8a(1) =24a(2) =30a(3) =90a(4) =231a(5) =631a(6) =1586a(7) =4230a(8) =11059a(9) =29053a(10) =75910a(11) =199512a(12) =522870a(13) =1370889a(14) =3593603a(15) =9425485a(16) =24711611a(17) =64792085a(18) =169885855a(19) =445461189a(20) =1167988296a(21) =3062473985a(22) =8029902757a(23) =21054655960a(24) =55205582288a(25) =144750167082a(26) =379538412292

External references