|
Search: id:A037026
|
|
|
| A037026 |
|
B-trees of order 4 with n leaves. |
|
+0
5
|
|
| 0, 1, 1, 1, 2, 2, 4, 5, 9, 15, 28, 45, 73, 116, 199, 345, 601, 1021, 1738, 2987, 5244, 9321, 16720, 30103, 54345, 97996, 176011, 314045, 556577, 980852, 1722451, 3020214, 5298570, 9316456, 16440262, 29136489, 51860214, 92643425, 165934156
(list; graph; listen)
|
|
|
OFFSET
|
0,5
|
|
|
LINKS
|
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Index entries for sequences related to rooted trees
|
|
MAPLE
|
spec := [ B, {B=Union(Z, Subst(M, B)), M=Union(Prod(Z, Z), Prod(Z, Z, Z), Prod(Z$4))} ]: [ seq(combstruct[count](spec, size=n), n=0..42) ];
|
|
CROSSREFS
|
Cf. A014535.
Sequence in context: A050192 A007147 A127968 this_sequence A116651 A135586 A116646
Adjacent sequences: A037023 A037024 A037025 this_sequence A037027 A037028 A037029
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com), Paul.Zimmermann(AT)loria.fr
|
|
|
Search completed in 0.002 seconds
|
