Number of 3Xn arrays of the minimum value of corresponding elements and their horizontal, vertical or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 3Xn array.
A220012
Number of 3Xn arrays of the minimum value of corresponding elements and their horizontal, vertical or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 3Xn array.
Terms
- a(0) =10a(1) =20a(2) =109a(3) =479a(4) =1735a(5) =5686a(6) =17525a(7) =51891a(8) =148887a(9) =415328a(10) =1127801a(11) =2983759a(12) =7698970a(13) =19398768a(14) =47793075a(15) =115286948a(16) =272626057a(17) =632754218a(18) =1442939429a(19) =3236143029a(20) =7144195995a(21) =15536960940a(22) =33309810566a(23) =70444500191a(24) =147041223854
External references
- oeis: A220012