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Binomial coefficient C(3n,n-4).
1

%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_