Number of 6X6X6 triangular 0..n arrays with every horizontal row nondecreasing, first elements of rows nonincreasing, last elements of rows nondecreasing, and every row having the same average value.
A215186
Number of 6X6X6 triangular 0..n arrays with every horizontal row nondecreasing, first elements of rows nonincreasing, last elements of rows nondecreasing, and every row having the same average value.
Terms
- a(0) =2a(1) =48a(2) =328a(3) =3216a(4) =18940a(5) =102958a(6) =437416a(7) =1745476a(8) =6074164a(9) =19546414a(10) =57274236a(11) =158706286a(12) =408770608a(13) =1005752468a(14) =2347176012a(15) =5262852883a(16) =11312035800a(17) =23548549548a(18) =47322841540a(19) =92544936670a(20) =175876801036a(21) =326378292388
External references
- oeis: A215186