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A019525 Poincare series for depths of roots in a certain root system. 0
2, 3, 6, 12, 27, 60, 138, 315, 726, 1668, 3843, 8844, 20370, 46899, 108006, 248700, 572715, 1318812, 3036954, 6993387, 16104246, 37084404, 85397139, 196650348, 452841762, 1042792803, 2401318086, 5529696492, 12733650747, 29322740220 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

REFERENCES

Posting to sci.math.research by dima(AT)win.tue.nl (Dmitrii V. Pasechnik), Oct 28 1996.

FORMULA

a(n)=2a(n-1)+2a(n-2)-3a(n-3).

CROSSREFS

Sequence in context: A001677 A024422 A186771 * A108915 A082395 A061343

Adjacent sequences:  A019522 A019523 A019524 * A019526 A019527 A019528

KEYWORD

nonn

AUTHOR

Robert G. Wilson v (rgwv(AT)rgwv.com)

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Last modified February 14 03:37 EST 2012. Contains 205570 sequences.