a(n+1) = a(n) + sum of digits of a(n)^2, with a(1) = 1.

Terms

a(0) =1a(1) =2a(2) =6a(3) =15a(4) =24a(5) =42a(6) =60a(7) =69a(8) =87a(9) =114a(10) =141a(11) =168a(12) =186a(13) =213a(14) =240a(15) =258a(16) =285a(17) =303a(18) =330a(19) =348a(20) =357a(21) =384a(22) =411a(23) =438a(24) =465a(25) =483a(26) =510a(27) =519a(28) =546a(29) =573