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Operad: Hybridative

abbreviation
Hyb
category
Zset
type
non-symetrique
dimensions

1, 2, 7, 31, 154, 820, 4575, 26398

OEIS: A007863

Formula: sum(binomial(n+k-1,k)*binomial(n+k,n-1-k) for k in range(n))/n

Equation: x+(x-1)*P+P**2+P**3

properties
binary, quadratic, cyclic, Koszul
generateurs
  • generator Δ of arity 2 of degree 0
  • generator _ of arity 2 of degree 1
relations
  • equality: (x_y)_z = x_(y_z)

References