Number of n X 4 arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..1 n X 4 array.
A219287
Number of n X 4 arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..1 n X 4 array.
Terms
- a(0) =4a(1) =9a(2) =42a(3) =149a(4) =423a(5) =1092a(6) =2623a(7) =5937a(8) =12729a(9) =26009a(10) =50896a(11) =95774a(12) =173920a(13) =305737a(14) =521743a(15) =866485a(16) =1403565a(17) =2221983a(18) =3444020a(19) =5234902a(20) =7814504a(21) =11471371a(22) =16579351a(23) =23617153a(24) =33191161a(25) =46061853a(26) =63174192a(27) =85692374a(28) =115039336a(29) =152941445
External references
- oeis: A219287