Number of nX4 0..1 arrays with exactly n+4-2 having value 1 and no three 1s forming an isosceles right triangle.

A272954

Number of nX4 0..1 arrays with exactly n+4-2 having value 1 and no three 1s forming an isosceles right triangle.

Terms

    a(0) =4a(1) =21a(2) =24a(3) =60a(4) =210a(5) =637a(6) =1840a(7) =5792a(8) =18556a(9) =54034a(10) =160246a(11) =499140a(12) =1501706a(13) =4627363a(14) =13954490a(15) =43064736a(16) =131174878a(17) =399170874a(18) =1222825766a(19) =3739040310a(20) =11456400210a(21) =35068696769a(22) =107362206600a(23) =329271410590

External references