Number of 3Xn 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..3 3Xn array.
A219830
Number of 3Xn 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..3 3Xn array.
Terms
- a(0) =20a(1) =60a(2) =394a(3) =2106a(4) =9920a(5) =45471a(6) =186016a(7) =724385a(8) =2669247a(9) =9382490a(10) =31608418a(11) =102225635a(12) =318518736a(13) =959098084a(14) =2798488049a(15) =7930889244a(16) =21872282847a(17) =58800825814a(18) =154339095726a(19) =396109474270a(20) =995411502191
External references
- oeis: A219830