First denominator and then numerator of the central elements of the 1/4-Pascal triangle (by row).

Terms

a(0) =1a(1) =1a(2) =4a(3) =1a(4) =2a(5) =5a(6) =2a(7) =19a(8) =1a(9) =35a(10) =2a(11) =259a(12) =1a(13) =483a(14) =1a(15) =1815a(16) =1a(17) =6864a(18) =2a(19) =52195a(20) =1a(21) =99671a(22) =1a(23) =382109a(24) =1a(25) =1469650a(26) =1a(27) =5668327a(28) =1a(29) =21915550