Numerator of Catalan(n)/2^(2n+1). Also, numerators of (2n-1)!!/(n+1)!. Odd part of the n-th Catalan number.

A098597

Numerator of Catalan(n)/2^(2n+1). Also, numerators of (2n-1)!!/(n+1)!. Odd part of the n-th Catalan number.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =5a(4) =7a(5) =21a(6) =33a(7) =429a(8) =715a(9) =2431a(10) =4199a(11) =29393a(12) =52003a(13) =185725a(14) =334305a(15) =9694845a(16) =17678835a(17) =64822395a(18) =119409675a(19) =883631595a(20) =1641030105a(21) =6116566755a(22) =11435320455a(23) =171529806825a(24) =322476036831

External references