Triangular array given by rows: P(n,k) is the number of partitions of n that contain k as a part.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =1a(5) =1a(6) =3a(7) =2a(8) =1a(9) =1a(10) =5a(11) =3a(12) =2a(13) =1a(14) =1a(15) =7a(16) =5a(17) =3a(18) =2a(19) =1a(20) =1a(21) =11a(22) =7a(23) =5a(24) =3a(25) =2a(26) =1a(27) =1a(28) =15a(29) =11