Subtract n from partial sums of partial sums of Catalan numbers.

Terms

a(0) =1a(1) =2a(2) =5a(3) =13a(4) =35a(5) =99a(6) =295a(7) =920a(8) =2975a(9) =9892a(10) =33605a(11) =116104a(12) =406615a(13) =1440026a(14) =5147877a(15) =18550573a(16) =67310939a(17) =245716095a(18) =901759951a(19) =3325066997a(20) =12312494463a(21) =45766188949a(22) =170702447075a(23) =638698318851