Distinct numbers in writing first numerator and then denominator of the central elements of the 1/4-Pascal triangle (by row).

A046574

Distinct numbers in writing first numerator and then denominator of the central elements of the 1/4-Pascal triangle (by row).

Terms

    a(0) =1a(1) =4a(2) =5a(3) =2a(4) =19a(5) =35a(6) =259a(7) =483a(8) =1815a(9) =6864a(10) =52195a(11) =99671a(12) =382109a(13) =1469650a(14) =5668327a(15) =21915550a(16) =84913470a(17) =329624730a(18) =2563431075a(19) =4991324415a(20) =19463777025a(21) =75992317170a(22) =297026449005

External references