Number of n X 4 arrays of the minimum value of corresponding elements and their horizontal, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..1 n X 4 array.
A219515
Number of n X 4 arrays of the minimum value of corresponding elements and their horizontal, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..1 n X 4 array.
Terms
- a(0) =4a(1) =5a(2) =24a(3) =68a(4) =187a(5) =465a(6) =1090a(7) =2430a(8) =5181a(9) =10575a(10) =20714a(11) =39046a(12) =71023a(13) =124990a(14) =213360a(15) =354136a(16) =572847a(17) =904971a(18) =1398924a(19) =2119700a(20) =3153253a(21) =4611718a(22) =6639574a(23) =9420858a(24) =13187545a(25) =18229215a(26) =24904134a(27) =33651882a(28) =45007667a(29) =59618470
External references
- oeis: A219515