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A290361 Number of 7-leaf rooted trees with n levels. 2
0, 1, 15, 111, 518, 1789, 5026, 12166, 26328, 52221, 96613, 168861, 281502, 450905, 697984, 1048972, 1536256, 2199273, 3085467, 4251307, 5763366, 7699461, 10149854, 13218514, 17024440, 21703045, 27407601, 34310745, 42606046, 52509633, 64261884, 78129176 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..1000

B. A. Huberman and T. Hogg, Complexity and adaptation, Evolution, games and learning (Los Alamos, N.M., 1985). Phys. D 22 (1986), no. 1-3, 376-384.

Index entries for sequences related to rooted trees

Index entries for linear recurrences with constant coefficients, signature (7,-21,35,-35,21,-7,1).

FORMULA

G.f.: -(4*x^4+21*x^3+27*x^2+8*x+1)*x / (x-1)^7.

a(n) = (61*n^6+69*n^5+145*n^4+195*n^3+154*n^2+96*n)/6!.

MAPLE

a:= n-> (((((61*n+69)*n+145)*n+195)*n+154)*n+96)*n/6!:

seq(a(n), n=0..40);

CROSSREFS

Row n=7 of A290353.

Sequence in context: A199225 A290752 A290753 * A254869 A034184 A092646

Adjacent sequences:  A290358 A290359 A290360 * A290362 A290363 A290364

KEYWORD

nonn,easy

AUTHOR

Alois P. Heinz, Jul 28 2017

STATUS

approved

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Last modified April 21 04:56 EDT 2019. Contains 322310 sequences. (Running on oeis4.)