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A087887 a(n) = 18n^3 + 6n^2. 1
0, 24, 168, 540, 1248, 2400, 4104, 6468, 9600, 13608, 18600, 24684, 31968, 40560, 50568, 62100, 75264, 90168, 106920, 125628, 146400, 169344, 194568, 222180, 252288, 285000, 320424, 358668, 399840, 444048, 491400, 542004, 595968, 653400 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Another parametric representation of the solutions of the Diophantine equation x^2 - y^2 =z^3 is (x,y,z) = (15n^3, 3n^3, 6n^2), thus getting a(n) = 18n^3 + 6n^2.

LINKS

Table of n, a(n) for n=0..33.

FORMULA

O.g.f.: 12x(2+6x+x^2)/(-1+x)^4. a(n)=12*A036659(n). - R. J. Mathar, Apr 07 2008

CROSSREFS

Cf. A085409, A085482.

Sequence in context: A250142 A019583 A244908 * A288486 A223291 A221069

Adjacent sequences:  A087884 A087885 A087886 * A087888 A087889 A087890

KEYWORD

easy,nonn

AUTHOR

Jun Mizuki (suzuki32(AT)sanken.osaka-u.ac.jp), Oct 13 2003

EXTENSIONS

More terms from Ray Chandler, Nov 06 2003

STATUS

approved

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Last modified January 17 19:58 EST 2019. Contains 319251 sequences. (Running on oeis4.)