Number of (3+1) X (n+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.
A250785
Number of (3+1) X (n+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.
Terms
- a(0) =36a(1) =96a(2) =230a(3) =534a(4) =1194a(5) =2604a(6) =5568a(7) =11732a(8) =24442a(9) =50482a(10) =103566a(11) =211360a(12) =429580a(13) =870280a(14) =1758574a(15) =3546318a(16) =7139858a(17) =14356148a(18) =28835992a(19) =57872156a(20) =116068226a(21) =232660586a(22) =466169270a(23) =933710824a(24) =1869642084a(25) =3742876944a(26) =7491567158
External references
- oeis: A250785