Number of nX4 0..1 arrays with every element unequal to 1, 2, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A318548

Number of nX4 0..1 arrays with every element unequal to 1, 2, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =2a(1) =10a(2) =21a(3) =64a(4) =219a(5) =589a(6) =1782a(7) =5621a(8) =17333a(9) =54199a(10) =169770a(11) =532625a(12) =1674674a(13) =5267287a(14) =16571936a(15) =52167148a(16) =164217643a(17) =517100360a(18) =1628230629a(19) =5127481455a(20) =16147257228a(21) =50851033975a(22) =160145034188a(23) =504341598687

External references