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A069078 a(n) = n*(4*n^4 + 1). 0
0, 5, 130, 975, 4100, 12505, 31110, 67235, 131080, 236205, 400010, 644215, 995340, 1485185, 2151310, 3037515, 4194320, 5679445, 7558290, 9904415, 12800020, 16336425, 20614550, 25745395, 31850520, 39062525, 47525530, 57395655, 68841500, 82044625, 97200030, 114516635 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
REFERENCES
Konrad Knopp, Theory and application of infinite series, Dover, p. 268
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} (-1)^(n+1)/a(n) = log(2) - 1/2 (A187832). [Corrected by Amiram Eldar, Mar 08 2022]
MATHEMATICA
a[n_] := n*(4*n^4 + 1); Array[a, 40, 0] (* Amiram Eldar, Mar 08 2022 *)
CROSSREFS
Cf. A187832.
Sequence in context: A012226 A281818 A332317 * A003732 A203476 A203702
KEYWORD
easy,nonn
AUTHOR
Benoit Cloitre, Apr 05 2002
STATUS
approved

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Last modified February 26 11:46 EST 2024. Contains 370352 sequences. (Running on oeis4.)