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 A107404 E.g.f. = 1/(1-sinh(x))^2 0
 1, 2, 6, 26, 144, 962, 7536, 67706, 685824, 7730882, 95970816, 1300815386, 19113775104, 302616787202, 5135568746496, 92996021795066, 1789758460329984, 36479831022049922, 785020114093080576, 17785273588395966746 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS FORMULA a(n) = D^n(1/(1-x)^2) evaluated at x = 0, where D is the operator sqrt(1+x^2)*d/dx. Cf. A006154. - Peter Bala, Dec 06 2011 MAPLE E(x):=1/(1-sinh(x))^2: f[0]:=E(x): for n from 1 to 30 do f[n]:=diff(f[n-1], x) od: x:=0: seq(f[n], n=0..30); CROSSREFS Cf. A000557. A006154. Sequence in context: A171151 A177381 A127116 * A120574 A178324 A002710 Adjacent sequences:  A107401 A107402 A107403 * A107405 A107406 A107407 KEYWORD nonn AUTHOR Miklos Kristof, Jun 09 2005 STATUS approved

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