Let r, s, t, u be four permutations of the set { 1, 2, 3, ..., n }; a(n) = minimal value of Sum_{i=1..n} r(i)*s(i)*t(i)*u(i).
A070736
Let r, s, t, u be four permutations of the set { 1, 2, 3, ..., n }; a(n) = minimal value of Sum_{i=1..n} r(i)*s(i)*t(i)*u(i).
Terms
- a(0) =1a(1) =8a(2) =33a(3) =96a(4) =231a(5) =484a(6) =915a(7) =1608a(8) =2664a(9) =4208a(10) =6392a(11) =9392a(12) =13418a(13) =18706a(14) =25540a(15) =34224a(16) =45108a(17) =58588a(18) =75101a(19) =95120a(20) =119179a(21) =147856a(22) =181786a(23) =221648a(24) =268195a(25) =322220a(26) =384588a(27) =456232a(28) =538138a(29) =631362
External references
- oeis: A070736