Total sum of parts <= n of multiplicity 0 in all partitions of n.

Terms

a(0) =0a(1) =0a(2) =3a(3) =11a(4) =36a(5) =79a(6) =186a(7) =345a(8) =672a(9) =1163a(10) =2026a(11) =3273a(12) =5388a(13) =8301a(14) =12912a(15) =19349a(16) =28961a(17) =42071a(18) =61253a(19) =86921a(20) =123404a(21) =171972a(22) =239020a(23) =327386a(24) =447743a(25) =604255a(26) =813645a(27) =1084657a(28) =1441643a(29) =1899450