
 PlanetMath: Stirling numbers of the second kind 
  The recursive point of view, therefore explains the connection between the recurrence formula, and the original definition. 
  Since this relation holds for all polynomials, it also holds for all formal power series. 
  Crossreferences: section, formal power series, relation, sides, simple, solution, differential equation, operators, derivative, matrix, generate, powers, monomial, infinitedimensional, basis, obvious, indeterminate, polynomials, vector space, between, connection, recursive, division, one way, formula, initial conditions, terms, differential operators, falling factorial, generating function, recurrence relation, groups, partition, Stirling number, characterizations, equivalent, properties, natural numbers, sequence 
 planetmath.org /encyclopedia/StirlingNumbersSecondKind.html (530 words) 
