Sum of the sizes of the tails below the Durfee squares of all partitions of n.

Terms

a(0) =0a(1) =1a(2) =3a(3) =6a(4) =11a(5) =20a(6) =33a(7) =56a(8) =86a(9) =136a(10) =200a(11) =301a(12) =429a(13) =621a(14) =868a(15) =1219a(16) =1669a(17) =2297a(18) =3091a(19) =4171a(20) =5542a(21) =7357a(22) =9648a(23) =12652a(24) =16402a(25) =21250a(26) =27298a(27) =35003a(28) =44556a(29) =56637