A refinement of the formula for k -ary trees and the Gould-Vandermonde's convolution. Chen, Ricky X.F. — 2008 The Electronic Journal of Combinatorics [electronic only]
On Sequences G n satisfying G n = ( d + 2 ) G n - 1 - G n - 2 . Chen, Ricky X.F.; Shapiro, Louis W. — 2007 Journal of Integer Sequences [electronic only]