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A203073 G.f.: (4-4*x-20*x^2)/(1-19*x+2*x^2+78*x^3). 0
4, 72, 1340, 25004, 466780, 8714292, 162687676, 3037228420, 56702249852, 1058578651620, 19762686064316, 368951102430308, 6887976439220860, 128592160627319076, 2400696913051056700, 44818794864456212068, 836725520069635027964, 15620892932376170684580, 291627648675580388409788, 5444418948405843506235620 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

REFERENCES

Epstein, David B. A.; Iano-Fletcher, Anthony R.; and Zwick, Uri; Growth functions and automatic groups. Experiment. Math. 5 (1996), no. 4, 297-315.

LINKS

Table of n, a(n) for n=0..19.

CROSSREFS

Sequence in context: A100521 A111868 A060645 * A231033 A307358 A201976

Adjacent sequences:  A203070 A203071 A203072 * A203074 A203075 A203076

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 28 2011

STATUS

approved

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Last modified April 18 06:48 EDT 2019. Contains 322209 sequences. (Running on oeis4.)