Natural number transform of Aitken's triangle.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =9a(5) =15a(6) =20a(7) =28a(8) =40a(9) =60a(10) =75a(11) =100a(12) =135a(13) =185a(14) =260a(15) =312a(16) =402a(17) =522a(18) =684a(19) =906a(20) =1218a(21) =1421a(22) =1785a(23) =2254a(24) =2863a(25) =3661a(26) =4718a(27) =6139a(28) =7016a(29) =8640