Triangle read by rows: T(n,k) is the number of partial bijections (or subpermutations) of an n-element set of height k (height(alpha) = |Im(alpha)|) and with exactly 1 fixed point.

A144090

Triangle read by rows: T(n,k) is the number of partial bijections (or subpermutations) of an n-element set of height k (height(alpha) = |Im(alpha)|) and with exactly 1 fixed point.

Terms

    a(0) =1a(1) =2a(2) =0a(3) =3a(4) =6a(5) =3a(6) =4a(7) =24a(8) =36a(9) =8a(10) =5a(11) =60a(12) =210a(13) =220a(14) =45a(15) =6a(16) =120a(17) =780a(18) =1920a(19) =1590a(20) =264a(21) =7a(22) =210a(23) =2205a(24) =9940a(25) =19005a(26) =12978a(27) =1855a(28) =8a(29) =336

External references