Nearest integer to variance of n-th row of Pascal's triangle.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =5a(5) =16a(6) =56a(7) =198a(8) =699a(9) =2490a(10) =8943a(11) =32355a(12) =117800a(13) =431316a(14) =1587207a(15) =5867244a(16) =21777203a(17) =81127591a(18) =303240041a(19) =1136914129a(20) =4274441613a(21) =16111746161a(22) =60873695892a(23) =230495640009a(24) =874525192278