Number of (4+1) X (n+1) 0..1 arrays with every 2 X 2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.
A258557
Number of (4+1) X (n+1) 0..1 arrays with every 2 X 2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.
Terms
- a(0) =228a(1) =652a(2) =1244a(3) =1891a(4) =2509a(5) =3314a(6) =4313a(7) =5356a(8) =6331a(9) =7470a(10) =8820a(11) =10231a(12) =11591a(13) =13132a(14) =14901a(15) =16748a(16) =18561a(17) =20572a(18) =22828a(19) =25179a(20) =27513a(21) =30062a(22) =32873a(23) =35796a(24) =38719a(25) =41874a(26) =45308a(27) =48871a(28) =52451a(29) =56280
External references
- oeis: A258557