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A068380 Engel expansion of sinh(1/3). 0
1, 54, 180, 378, 648, 990, 1404, 1890, 2448, 3078, 3780, 4554, 5400, 6318, 7308, 8370, 9504, 10710, 11988, 13338, 14760, 16254, 17820, 19458, 21168, 22950, 24804, 26730, 28728, 30798, 32940, 35154, 37440, 39798, 42228, 44730, 47304, 49950 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Cf. A006784 for Engel expansion definition

LINKS

Table of n, a(n) for n=0..37.

FORMULA

a(0) = 1, a(n) = 36n^2 + 18n. - Ralf Stephan, Sep 03 2003

a(n) = 3*a(n-1)-3*a(n-2)+a(n-3) for n>3. G.f.: (1+51*x+21*x^2-x^3)/(1-x)^3. - Colin Barker, Apr 13 2012

CROSSREFS

Sequence in context: A044980 A248598 A157428 * A187299 A288626 A124007

Adjacent sequences:  A068377 A068378 A068379 * A068381 A068382 A068383

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Mar 03 2002

STATUS

approved

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Last modified August 18 20:02 EDT 2019. Contains 326109 sequences. (Running on oeis4.)