a(n) = number of decimal digits in the n-th odd Catalan number A038003(n).

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =7a(5) =17a(6) =35a(7) =74a(8) =150a(9) =304a(10) =612a(11) =1228a(12) =2460a(13) =4926a(14) =9857a(15) =19721a(16) =39449a(17) =78905a(18) =157818a(19) =315644a(20) =631296a(21) =1262601a(22) =2525212a(23) =5050435a(24) =10100879a(25) =20201769a(26) =40403550a(27) =80807112a(28) =161614235a(29) =323228483