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

A272961

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

Terms

    a(0) =1a(1) =0a(2) =1a(3) =0a(4) =8a(5) =8a(6) =71a(7) =212a(8) =731a(9) =1840a(10) =5953a(11) =18632a(12) =54705a(13) =171348a(14) =511899a(15) =1608540a(16) =4861373a(17) =14726040a(18) =45536993a(19) =138776184a(20) =426552305a(21) =1305642816a(22) =3998654049a(23) =12283464960a(24) =37639150053a(25) =115651510068a(26) =355188064346

External references