OFFSET
7,2
REFERENCES
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
Christian Sievers, Table of n, a(n) for n = 7..9286
J. Riordan, Enumeration of trees by height and diameter, IBM J. Res. Dev. 4 (1960), 473-478.
PROG
(PARI) \\ sh_euler is shifted Euler transform.
sh_euler(p)={my(m=serprec(p, x)-1); x*exp(sum(i=1, m, subst(p+O(x^(1+m\i)), x, x^i)/i))}
lista(n)={my(s0=x + O(x*x^n), s1=sh_euler(s0), s2=sh_euler(s1), s3=sh_euler(s2), r2=s2-s1, r3=s3-s2, t6=r3-r2*s2); Vec(t6)} \\ Christian Sievers, May 18 2023
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from Sean A. Irvine, Nov 21 2010
STATUS
approved