Number T(n,k) of endofunctions f on [n] satisfying f^3(i) = i for all i in [k]; triangle T(n,k), n>=0, 0<=k<=n, read by rows.
A245958
Number T(n,k) of endofunctions f on [n] satisfying f^3(i) = i for all i in [k]; triangle T(n,k), n>=0, 0<=k<=n, read by rows.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =4a(4) =2a(5) =1a(6) =27a(7) =11a(8) =5a(9) =3a(10) =256a(11) =88a(12) =36a(13) =18a(14) =9a(15) =3125a(16) =925a(17) =335a(18) =141a(19) =57a(20) =21a(21) =46656a(22) =12096a(23) =3912a(24) =1440a(25) =516a(26) =186a(27) =81a(28) =823543a(29) =189679
External references
- oeis: A245958