OFFSET
0,2
COMMENTS
See Nørlund for precise definition.
REFERENCES
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
LINKS
N. E. Nørlund, Vorlesungen über Differenzenrechnung, Springer, 1924, p. 461 and p. 147.
MAPLE
A213447 := proc(n)
local nu ;
nu := 2*n+1 ;
mul(t-i, i=1..nu) ;
int(%, t=0..1) ;
abs(numer( %)) ;
end proc:
seq(A213447(n), n=0..15) ; # R. J. Mathar, Jun 26 2012
MATHEMATICA
a[n_] := Integrate[Product[t-i, {i, 1, 2n+1}], {t, 0, 1}] // Numerator // Abs;
a /@ Range[0, 13] (* Jean-François Alcover, Apr 04 2020 *)
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
N. J. A. Sloane, Jun 12 2012
STATUS
approved