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A001505 (4n+1)(4n+2)(4n+3). 2
6, 210, 990, 2730, 5814, 10626, 17550, 26970, 39270, 54834, 74046, 97290, 124950, 157410, 195054, 238266, 287430, 342930, 405150, 474474, 551286, 635970, 728910, 830490, 941094, 1061106, 1190910, 1330890, 1481430, 1642914, 1815726, 2000250, 2196870, 2405970 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Sum[n=0..inf, 1/a(n)] = log(2)/4 = 0.17328679513998.. [Jolley eq. 253. Typo in comment fixed by Jaume Oliver Lafont, Jan 09 2009]

REFERENCES

Jolley, Summation of Series, Dover (1961)

LINKS

T. D. Noe, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (4,-6,4,-1)

FORMULA

G.f. 6*(1+x)*(x^2+30*x+1) / (x-1)^4 . - R. J. Mathar, Apr 02 2011

MATHEMATICA

Table[(4n+1)(4n+2)(4n+3), {n, 0, 49}] (* Vladimir Joseph Stephan Orlovsky, Jan 22 2012 *)

PROG

(MAGMA) [(4*n+1)*(4*n+2)*(4*n+3): n in [0..100]]; - Vincenzo Librandi, Apr 04 2011

CROSSREFS

Equals 6 * A015219.

Sequence in context: A068969 A094805 A055193 * A084694 A285149 A065945

Adjacent sequences:  A001502 A001503 A001504 * A001506 A001507 A001508

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified May 23 19:46 EDT 2017. Contains 286926 sequences.