%I #14 Oct 25 2023 00:27:10
%S 1,15,153,1330,10626,80730,593775,4272048,30260340,211915132,
%T 1471442973,10150595910,69668534468,476260169700,3245372870670,
%U 22057981462440,149608375854525,1012974972473835,6848956078664700
%N Binomial coefficient C(3n,n-4).
%D M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards Applied Math. Series 55, 1964 (and various reprintings), p. 828.
%H Seiichi Manyama, <a href="/A004322/b004322.txt">Table of n, a(n) for n = 4..1000</a>
%H Milan Janjic, <a href="http://www.pmfbl.org/janjic/">Two Enumerative Functions</a>.
%H M. Abramowitz and I. A. Stegun, eds., <a href="http://www.convertit.com/Go/ConvertIt/Reference/AMS55.ASP">Handbook of Mathematical Functions</a>, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy].
%K nonn,easy
%O 4,2
%A _N. J. A. Sloane_