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A099857
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Expansion of (1+3x+x^2)/(1-3x+x^2).
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1
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1, 6, 18, 48, 126, 330, 864, 2262, 5922, 15504, 40590, 106266, 278208, 728358, 1906866, 4992240, 13069854, 34217322, 89582112, 234529014, 614004930, 1607485776, 4208452398, 11017871418, 28845161856, 75517614150, 197707680594
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Hankel transform is : 1, -18, -36, 0, 0, 0, 0, 0, 0, 0, 0, ... - DELEHAM Philippe, Dec 15 2011
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FORMULA
| a(n)=0^n+6*Fib(2n).
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CROSSREFS
| Cf. A000045, A099856, A099858.
Sequence in context: A128543 A003202 A003198 * A163765 A179754 A086926
Adjacent sequences: A099854 A099855 A099856 * A099858 A099859 A099860
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KEYWORD
| easy,nonn
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Oct 28 2004
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