OFFSET
3,8
LINKS
R. J. Mathar, Table of n, a(n) for n = 3..212 (a(192) corrected by Sean A. Irvine, Apr 28 2022)
B. D. McKay, Lists of Trees sorted by diameter and Homeomorphically irreducible trees, with <= 22 nodes.
B. D. McKay, Lists of Trees sorted by diameter and Homeomorphically irreducible trees, with <= 22 nodes. [Cached copy of top page only, pdf file, no active links, with permission]
J. Riordan, Enumeration of trees by height and diameter, IBM J. Res. Dev. 4 (1960), 473-478.
J. Riordan, The enumeration of trees by height and diameter, IBM Journal 4 (1960), 473-478. (Annotated scanned copy)
FORMULA
Reference gives recurrence.
EXAMPLE
1
1 1
1 1 1
1 2 2 1
1 2 5 2 1
1 3 8 7 3 1
1 3 14 14 11 3 1
1 4 21 32 29 14 4 1
1 4 32 58 74 42 19 4 1
1 5 45 110 167 128 66 23 5 1
1 5 65 187 367 334 219 88 29 5 1
1 6 88 322 755 850 645 328 123 34 6 1
CROSSREFS
KEYWORD
AUTHOR
STATUS
approved