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A005491 n^3 + 3n + 1.
(Formerly M3855)
4
1, 5, 15, 37, 77, 141, 235, 365, 537, 757, 1031, 1365, 1765, 2237, 2787, 3421, 4145, 4965, 5887, 6917, 8061, 9325, 10715, 12237, 13897, 15701, 17655, 19765, 22037 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

E. G. Whitehead, Jr., Stirling number identities from chromatic polynomials, J. Combin. Theory, A 24 (1978), 314-317.

LINKS

Table of n, a(n) for n=0..28.

Simon Plouffe, Approximations de séries génératrices et quelques conjectures, Dissertation, Université du Québec à Montréal, 1992.

Simon Plouffe, 1031 Generating Functions and Conjectures, Université du Québec à Montréal, 1992.

MAPLE

A005491:=(1+z+z**2+3*z**3)/(z-1)**4; [Conjectured by Simon Plouffe in his 1992 dissertation.]

CROSSREFS

Sequence in context: A109818 A146797 A213487 * A050488 A142964 A188282

Adjacent sequences:  A005488 A005489 A005490 * A005492 A005493 A005494

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Simon Plouffe

STATUS

approved

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Last modified April 21 12:08 EDT 2014. Contains 240824 sequences.