Number of nX2 0..1 arrays with every element unequal to 0, 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A318039

Number of nX2 0..1 arrays with every element unequal to 0, 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =2a(2) =2a(3) =3a(4) =6a(5) =17a(6) =46a(7) =124a(8) =341a(9) =947a(10) =2630a(11) =7299a(12) =20261a(13) =56255a(14) =156198a(15) =433692a(16) =1204166a(17) =3343438a(18) =9283267a(19) =25775570a(20) =71567465a(21) =198711506a(22) =551734848a(23) =1531926101a(24) =4253488019a(25) =11810073810a(26) =32791403883a(27) =91047370757a(28) =252798683167

External references