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A001241 Differences of reciprocals of unity.
(Formerly M5301 N2305)
3
1, 50, 1660, 46760, 1217776, 30480800, 747497920, 18139003520, 437786795776, 10536798272000, 253246254177280, 6082300519393280, 146028165842661376, 3505313580591718400, 84135194495708938240, 2019336829962040279040 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

F. N. David, M. G. Kendall and D. E. Barton, Symmetric Function and Allied Tables, Cambridge, 1966, p. 228.

M. Merca, Some experiments with complete and elementary symmetric functions, - Periodica Mathematica Hungarica, 69 (2014), 182-189.

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

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

LINKS

Table of n, a(n) for n=1..16.

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.

FORMULA

G.f.: x / [(1-6x)(1-8x)(1-12x)(1-24x) ].

(1/6) [ -6^n + 3*8^n - 3*12^n + 24^n ].

MAPLE

A001241:=1/(6*z-1)/(8*z-1)/(12*z-1)/(24*z-1); [Conjectured by Simon Plouffe in his 1992 dissertation.]

CROSSREFS

Equals 2^(n-1) * A028037(n-1).

Right-hand column 3 in triangle A008969.

Cf. a(n)=A112492(n+2, 4).

Sequence in context: A159187 A075912 A062151 * A164986 A224121 A238283

Adjacent sequences:  A001238 A001239 A001240 * A001242 A001243 A001244

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

EXTENSIONS

Formulae and more terms from Ralf Stephan, Feb 20 2005

STATUS

approved

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Last modified August 19 01:29 EDT 2017. Contains 290787 sequences.