A203073 G.f.: (4-4*x-20*x^2)/(1-19*x+2*x^2+78*x^3).

4, 72, 1340, 25004, 466780, 8714292, 162687676, 3037228420, 56702249852, 1058578651620, 19762686064316, 368951102430308, 6887976439220860, 128592160627319076, 2400696913051056700, 44818794864456212068, 836725520069635027964, 15620892932376170684580, 291627648675580388409788, 5444418948405843506235620

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: A111868 A060645 A363987 * A231033 A307358 A201976

Adjacent sequences: A203070 A203071 A203072 * A203074 A203075 A203076

Keyword

nonn

Author

N. J. A. Sloane, Dec 28 2011

Status

approved