Numerator of mean deviation of a symmetrical binomial distribution on n elements.

Terms

a(0) =1a(1) =1a(2) =3a(3) =3a(4) =15a(5) =15a(6) =35a(7) =35a(8) =315a(9) =315a(10) =693a(11) =693a(12) =3003a(13) =3003a(14) =6435a(15) =6435a(16) =109395a(17) =109395a(18) =230945a(19) =230945a(20) =969969a(21) =969969a(22) =2028117a(23) =2028117a(24) =16900975a(25) =16900975a(26) =35102025a(27) =35102025a(28) =145422675a(29) =145422675