Total sum of parts of multiplicity 2 in all partitions of n.

Terms

a(0) =0a(1) =0a(2) =1a(3) =0a(4) =3a(5) =3a(6) =7a(7) =9a(8) =20a(9) =22a(10) =44a(11) =56a(12) =90a(13) =119a(14) =186a(15) =236a(16) =355a(17) =461a(18) =651a(19) =848a(20) =1177a(21) =1506a(22) =2050a(23) =2626a(24) =3482a(25) =4443a(26) =5823a(27) =7353a(28) =9524a(29) =11983