a(1) = 1, a(n+1) is the sum of a(n) and ceiling( arithmetic mean of a(1) ... a(n) ).

Terms

a(0) =1a(1) =2a(2) =4a(3) =7a(4) =11a(5) =16a(6) =23a(7) =33a(8) =46a(9) =62a(10) =83a(11) =110a(12) =144a(13) =186a(14) =238a(15) =303a(16) =383a(17) =481a(18) =600a(19) =744a(20) =918a(21) =1128a(22) =1380a(23) =1681a(24) =2039a(25) =2464a(26) =2968a(27) =3563a(28) =4264a(29) =5088