Number of distinct prime factors of the n-th odd Catalan number, A038003(n).

Terms

a(0) =0a(1) =1a(2) =3a(3) =6a(4) =11a(5) =20a(6) =36a(7) =64a(8) =117a(9) =209a(10) =381a(11) =699a(12) =1291a(13) =2387a(14) =4445a(15) =8317a(16) =15645a(17) =29494a(18) =55855a(19) =106021a(20) =201778a(21) =384941a(22) =735909a(23) =1409683a(24) =2705277a(25) =5200202