Triangle read by rows: T(n,k) = (1/k) times the number of functions from an n-element set into but not onto a k-element set.

A101031

Triangle read by rows: T(n,k) = (1/k) times the number of functions from an n-element set into but not onto a k-element set.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =0a(4) =1a(5) =7a(6) =0a(7) =1a(8) =15a(9) =58a(10) =0a(11) =1a(12) =31a(13) =196a(14) =601a(15) =0a(16) =1a(17) =63a(18) =634a(19) =2765a(20) =7656a(21) =0a(22) =1a(23) =127a(24) =1996a(25) =12265a(26) =44136a(27) =116929a(28) =0a(29) =1

External references