Nearest integer to 24*(2^n - 1)/n.

Terms

a(0) =24a(1) =36a(2) =56a(3) =90a(4) =149a(5) =252a(6) =435a(7) =765a(8) =1363a(9) =2455a(10) =4466a(11) =8190a(12) =15122a(13) =28085a(14) =52427a(15) =98303a(16) =185041a(17) =349524a(18) =662257a(19) =1258290a(20) =2396744a(21) =4575603a(22) =8753329a(23) =16777215a(24) =32212254a(25) =61946643a(26) =119304646a(27) =230087533