Distinct numbers seen when writing first numerator and then denominator of central elements of 1/2-Pascal triangle.

A046224

Distinct numbers seen when writing first numerator and then denominator of central elements of 1/2-Pascal triangle.

Terms

    a(0) =1a(1) =2a(2) =3a(3) =11a(4) =40a(5) =147a(6) =546a(7) =2046a(8) =7722a(9) =29315a(10) =111826a(11) =428298a(12) =1646008a(13) =6344366a(14) =24515700a(15) =94942620a(16) =368404110a(17) =1431985635a(18) =5574725970a(19) =21732560850a(20) =84828633120a(21) =331488081210

External references