Signed recurrence over strict trees: a(n) = -1 + Sum_{y1 + ... + yk = n, y1 > ... > yk > 0, k > 1} a(y1) * ... * a(yk).
A300864
Signed recurrence over strict trees: a(n) = -1 + Sum_{y1 + ... + yk = n, y1 > ... > yk > 0, k > 1} a(y1) * ... * a(yk).
Terms
- a(0) =1a(1) =1a(2) =0a(3) =1a(4) =0a(5) =0a(6) =2a(7) =-1a(8) =0a(9) =4a(10) =-6a(11) =6a(12) =6a(13) =-24a(14) =38a(15) =-17a(16) =-64a(17) =188a(18) =-230a(19) =-6a(20) =662a(21) =-1432a(22) =1286a(23) =1210a(24) =-6362a(25) =10692a(26) =-5530a(27) =-18274a(28) =57022a(29) =-74364
External references
- oeis: A300864