Numerator of variance of n-th row of Pascal's triangle.

Terms

a(0) =0a(1) =0a(2) =1a(3) =4a(4) =47a(5) =244a(6) =1186a(7) =1384a(8) =25147a(9) =112028a(10) =98374a(11) =1067720a(12) =1531401a(13) =39249768a(14) =166656772a(15) =88008656a(16) =2961699667a(17) =12412521388a(18) =51854046982a(19) =108006842264a(20) =448816369361