Self-convolution cube of A073711.

Terms

a(0) =1a(1) =3a(2) =6a(3) =13a(4) =21a(5) =36a(6) =58a(7) =93a(8) =141a(9) =203a(10) =306a(11) =420a(12) =616a(13) =828a(14) =1188a(15) =1569a(16) =2181a(17) =2877a(18) =3878a(19) =5085a(20) =6651a(21) =8844a(22) =11148a(23) =14928a(24) =18196a(25) =24864a(26) =29118a(27) =40540a(28) =45858a(29) =65280