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A068552 2n*binomial(2n,n) - 4^n. 0
-1, 0, 8, 56, 304, 1496, 6992, 31664, 140384, 613016, 2646544, 11325200, 48122528, 203306736, 854829344, 3579783776, 14939605184, 62162742296, 257985394064, 1068242117456, 4414349525024, 18208784215376, 74988168359264, 308369069291936 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Known to be >= 0 for n>0.

REFERENCES

Hojoo Lee, Posting to Number Theory List, Feb 18 2002.

LINKS

Table of n, a(n) for n=0..23.

CROSSREFS

Sequence in context: A003210 A135417 A248332 * A264946 A319891 A319872

Adjacent sequences:  A068549 A068550 A068551 * A068553 A068554 A068555

KEYWORD

sign

AUTHOR

N. J. A. Sloane, Mar 23 2002

STATUS

approved

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Last modified July 15 20:24 EDT 2019. Contains 325056 sequences. (Running on oeis4.)