Numbers k such that k-th Catalan number C(2k,k)/(k+1) is divisible by k.

Terms

a(0) =1a(1) =2a(2) =6a(3) =15a(4) =20a(5) =28a(6) =42a(7) =45a(8) =66a(9) =77a(10) =88a(11) =91a(12) =104a(13) =110a(14) =126a(15) =140a(16) =153a(17) =156a(18) =170a(19) =187a(20) =190a(21) =204a(22) =209a(23) =210a(24) =220a(25) =228a(26) =231a(27) =238a(28) =240a(29) =266