a(n) = Sum_{i=1..n} Ulam(i), where Ulam(i) denotes the i-th Ulam number.

Terms

a(0) =1a(1) =3a(2) =6a(3) =10a(4) =16a(5) =24a(6) =35a(7) =48a(8) =64a(9) =82a(10) =108a(11) =136a(12) =172a(13) =210a(14) =257a(15) =305a(16) =358a(17) =415a(18) =477a(19) =546a(20) =618a(21) =695a(22) =777a(23) =864a(24) =961a(25) =1060a(26) =1162a(27) =1268a(28) =1382a(29) =1508