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

A317890

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

Terms

    a(0) =0a(1) =1a(2) =1a(3) =2a(4) =5a(5) =16a(6) =45a(7) =123a(8) =340a(9) =946a(10) =2629a(11) =7298a(12) =20260a(13) =56254a(14) =156197a(15) =433691a(16) =1204165a(17) =3343437a(18) =9283266a(19) =25775569a(20) =71567464a(21) =198711505a(22) =551734847a(23) =1531926100a(24) =4253488018a(25) =11810073809a(26) =32791403882a(27) =91047370756a(28) =252798683166

External references