Minimum over all permutations b of 1..n of sum b(i)*b^{-1}(i).

Terms

a(0) =1a(1) =5a(2) =11a(3) =20a(4) =35a(5) =57a(6) =85a(7) =120a(8) =165a(9) =221a(10) =287a(11) =364a(12) =455a(13) =561a(14) =681a(15) =816a(16) =969a(17) =1141a(18) =1331a(19) =1540a(20) =1771a(21) =2025a(22) =2301a(23) =2600a(24) =2925a(25) =3277a(26) =3655a(27) =4060a(28) =4495a(29) =4961