Triangle of central factorial numbers T(2*n,2*n-2*k), k >= 0, n >= 1 (in Riordan's notation).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =1a(6) =1a(7) =14a(8) =21a(9) =1a(10) =1a(11) =30a(12) =147a(13) =85a(14) =1a(15) =1a(16) =55a(17) =627a(18) =1408a(19) =341a(20) =1a(21) =1a(22) =91a(23) =2002a(24) =11440a(25) =13013a(26) =1365a(27) =1a(28) =1a(29) =140