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A160465
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First left hand column of the Eta triangle A160464
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2
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-1, -11, -114, -3963, -104745, -3926745, -198491580, -26045435115, -2153099119815, -219022225836750, -26891482281048000, -3921682257253270125, -670160622793156369875, -132649536458654226136125
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,2
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MAPLE
| restart; nmax:=16; mmax:=nmax: c(2):=-1/3: for n from 3 to nmax do c(n):=(2*n-2)*c(n-1)/(2*n-1)-1/ ((n-1)*(2*n-1)) end do: for n from 2 to nmax do GCS(n-1):=ln(1/(2^(-(2*(n-1)-1-floor(ln(n-1)/ ln(2))))))/ln(2) od: for n from 2 to nmax do p(n):=2^(-GCS(n-1))*(2*n-1)! od: for n from 2 to nmax do ETA(n, 1):=p(n)*c(n) end do: a:=n-> ETA(n, 1): seq(a(n), n=2..nmax);
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CROSSREFS
| A160464 is the Eta triangle.
The GCS(n) sequence equals the geometric Connell sequence A049039(n).
Sequence in context: A088089 A201966 A121196 * A125446 A076554 A173616
Adjacent sequences: A160462 A160463 A160464 * A160466 A160467 A160468
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KEYWORD
| easy,sign
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AUTHOR
| Johannes W. Meijer (meijgia(AT)hotmail.com), May 24 2009
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