Diagonal sum of left justified array T given by A027082.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =3a(5) =6a(6) =8a(7) =11a(8) =17a(9) =25a(10) =34a(11) =53a(12) =76a(13) =107a(14) =163a(15) =236a(16) =335a(17) =506a(18) =734a(19) =1050a(20) =1575a(21) =2290a(22) =3291a(23) =4915a(24) =7156a(25) =10321a(26) =15362a(27) =22392a(28) =32381a(29) =48075