Sum of binomial(Y(2,p), 2) over the partitions p of n, where Y(2,p) is the number of part sizes with multiplicity 2 or greater in p.

A304825

Sum of binomial(Y(2,p), 2) over the partitions p of n, where Y(2,p) is the number of part sizes with multiplicity 2 or greater in p.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =4a(4) =9a(5) =12a(6) =22a(7) =30a(8) =50a(9) =68a(10) =105a(11) =142a(12) =210a(13) =281a(14) =400a(15) =531a(16) =736a(17) =967a(18) =1311a(19) =1707a(20) =2274a(21) =2935a(22) =3851a(23) =4930a(24) =6389a(25) =8116a(26) =10402a(27) =13121a(28) =16658a(29) =20872

External references