a(n) is the number of partitions of 4n that can be obtained by adding together four (not necessarily distinct) partitions of n.

A002221

a(n) is the number of partitions of 4n that can be obtained by adding together four (not necessarily distinct) partitions of n.

Terms

    a(0) =1a(1) =5a(2) =15a(3) =55a(4) =140a(5) =448a(6) =1022a(7) =2710a(8) =6048a(9) =14114a(10) =28831a(11) =64091a(12) =123649a(13) =251295a(14) =476835a(15) =916972a(16) =1654044a(17) =3080159a(18) =5377431a(19) =9624588a(20) =16490017a(21) =28433473a(22) =47423409a(23) =80279375

External references