Number of series-reduced rooted identity trees whose leaves are strict integer partitions whose multiset union is an integer partition of n.

A320177

Number of series-reduced rooted identity trees whose leaves are strict integer partitions whose multiset union is an integer partition of n.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =5a(4) =11a(5) =26a(6) =65a(7) =169a(8) =463a(9) =1294a(10) =3691a(11) =10700a(12) =31417a(13) =93175a(14) =278805a(15) =840424a(16) =2549895a(17) =7780472a(18) =23860359a(19) =73500838a(20) =227330605a(21) =705669634a(22) =2197750615a(23) =6865335389a(24) =21505105039a(25) =67533738479a(26) =212575923471a(27) =670572120240

External references