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

A318345

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

Terms

    a(0) =3a(1) =4a(2) =6a(3) =13a(4) =21a(5) =41a(6) =71a(7) =130a(8) =237a(9) =439a(10) =802a(11) =1483a(12) =2734a(13) =5067a(14) =9351a(15) =17309a(16) =32017a(17) =59290a(18) =109700a(19) =203097a(20) =375959a(21) =696116a(22) =1288668a(23) =2385953a(24) =4417419a(25) =8178970a(26) =15142943a(27) =28037280a(28) =51910866a(29) =96113811

External references