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Numerator of n*(n-1)*(n-2)/720.
2

%I #16 Jan 12 2023 17:20:14

%S 0,0,0,1,1,1,1,7,7,7,1,11,11,143,91,91,14,17,34,323,19,133,77,1771,

%T 253,115,65,195,273,609,203,899,124,682,748,1309,119,259,703,9139,247,

%U 533,287,12341,3311,473,253,1081,2162,2303,490,4165,1105,11713

%N Numerator of n*(n-1)*(n-2)/720.

%D R. L. Graham, D. E. Knuth and O. Patashnik, Concrete Mathematics. Addison-Wesley, Reading, MA, 1990, p. 269.

%H Enrique Pérez Herrero, <a href="/A051726/b051726.txt">Table of n, a(n) for n = 0..2000</a>

%o (PARI) A051726(n)=numerator(n*(n-1)*(n-2)/720); \\ _Enrique Pérez Herrero_, Jan 12 2023

%Y Cf. A051727 (denominator).

%K nonn,easy,frac

%O 0,8

%A _N. J. A. Sloane_