Number of (n+1) X (4+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.
A250779
Number of (n+1) X (4+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) =99a(1) =238a(2) =534a(3) =1152a(4) =2426a(5) =5028a(6) =10306a(7) =20960a(8) =42394a(9) =85420a(10) =171666a(11) =344392a(12) =690122a(13) =1381908a(14) =2765858a(15) =5534192a(16) =11071354a(17) =22146236a(18) =44296626a(19) =88598104a(20) =177201834a(21) =354410148a(22) =708827714a(23) =1417663872a(24) =2835337306a(25) =5670685388a(26) =11341382866
External references
- oeis: A250779