Distinct even numbers in the triangle of denominators in Leibniz's Harmonic Triangle.

Terms

a(0) =2a(1) =6a(2) =4a(3) =12a(4) =20a(5) =30a(6) =60a(7) =42a(8) =140a(9) =8a(10) =56a(11) =168a(12) =280a(13) =72a(14) =252a(15) =504a(16) =630a(17) =10a(18) =90a(19) =360a(20) =840a(21) =1260a(22) =110a(23) =1320a(24) =2310a(25) =2772a(26) =132a(27) =660a(28) =1980a(29) =3960