Partition triangle read by rows. Number of ordered set partitions of the set {1, 2, ..., 2*n} with all block sizes divisible by 2.

A327022

Partition triangle read by rows. Number of ordered set partitions of the set {1, 2, ..., 2*n} with all block sizes divisible by 2.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =6a(4) =1a(5) =30a(6) =90a(7) =1a(8) =56a(9) =70a(10) =1260a(11) =2520a(12) =1a(13) =90a(14) =420a(15) =3780a(16) =9450a(17) =75600a(18) =113400a(19) =1a(20) =132a(21) =990a(22) =924a(23) =8910a(24) =83160a(25) =34650a(26) =332640a(27) =1247400a(28) =6237000a(29) =7484400

External references