Self-convolution of repeated Catalan numbers.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =7a(5) =10a(6) =19a(7) =28a(8) =56a(9) =84a(10) =174a(11) =264a(12) =561a(13) =858a(14) =1859a(15) =2860a(16) =6292a(17) =9724a(18) =21658a(19) =33592a(20) =75582a(21) =117572a(22) =266798a(23) =416024a(24) =950912a(25) =1485800a(26) =3417340a(27) =5348880a(28) =12369285a(29) =19389690