Product{[n/k + 1/2]: k=1,2,...,n}, where [x + 1/2] denotes the integer nearest to x.

Terms

a(0) =1a(1) =2a(2) =6a(3) =8a(4) =30a(5) =72a(6) =112a(7) =384a(8) =1080a(9) =1800a(10) =6336a(11) =13824a(12) =26208a(13) =94080a(14) =345600a(15) =368640a(16) =1057536a(17) =5598720a(18) =6566400a(19) =24192000a(20) =74511360a(21) =93671424a(22) =457850880a(23) =955514880a(24) =2156544000a(25) =5887365120a(26) =16460236800a(27) =40967700480a(28) =101025792000