OFFSET
1,3
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..500
V. P. Johnson, Enumeration Results on Leaf Labeled Trees, Ph. D. Dissertation, Univ. Southern Calif., 2012.
FORMULA
PROG
(PARI) my(N=30); U(N, 2) - 2*U(N, 1) \\ See A339650 for U(n, k). - Andrew Howroyd, Dec 14 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 22 2012
EXTENSIONS
Terms a(11) and beyond from Andrew Howroyd, Dec 14 2020
STATUS
approved