Number of 4Xn arrays of the minimum value of corresponding elements and their horizontal or diagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 4Xn array.
A220156
Number of 4Xn arrays of the minimum value of corresponding elements and their horizontal or diagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 4Xn array.
Terms
- a(0) =15a(1) =52a(2) =242a(3) =1174a(4) =4559a(5) =16110a(6) =53947a(7) =173732a(8) =539903a(9) =1620236a(10) =4698464a(11) =13180052a(12) =35802185a(13) =94277039a(14) =240952485a(15) =598495844a(16) =1446788180a(17) =3408685943a(18) =7838407335a(19) =17616947657a(20) =38749982170a(21) =83520468048a(22) =176604065342a(23) =366743870453
External references
- oeis: A220156