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A069073 n*(4n^2-1)^2. 0
0, 9, 450, 3675, 15876, 49005, 122694, 266175, 520200, 938961, 1592010, 2566179, 3967500, 5923125, 8583246, 12123015, 16744464, 22678425, 30186450, 39562731, 51136020, 65271549, 82372950, 102884175, 127291416, 156125025, 189961434 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

REFERENCES

Jolley, Summation of Series, Dover (1961), eq (104) on page 20.

Konrad Knopp, Theory and application of infinite series, Dover, p. 269

LINKS

Konrad Knopp, Theorie und Anwendung der unendlichen Reihen, Berlin, J. Springer, 1922. (Original german edition of "Theory and Application of Infinite Series")

FORMULA

sum(n=1, inf) 1/a(n) = 3/2 -2*ln(2) = 0.113705638880109...

CROSSREFS

Sequence in context: A167720 A173954 A196965 * A156086 A160478 A020263

Adjacent sequences:  A069070 A069071 A069072 * A069074 A069075 A069076

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 05 2002

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.