Arithmetic mean of row n in A112668.

Terms

a(0) =1a(1) =2a(2) =7a(3) =10a(4) =311a(5) =651a(6) =42799a(7) =410a(8) =9709a(9) =43584805a(10) =6140565047a(11) =5086263a(15) =1345210a(17) =52981906467a(19) =87169610