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C(n+2,2)*C(n+4,2).
1

%I #8 Oct 09 2013 09:33:28

%S 6,30,90,210,420,756,1260,1980,2970,4290

%N C(n+2,2)*C(n+4,2).

%C Duplicates A033487.

%F a(n)=A033487(n+1). [From _R. J. Mathar_, Aug 24 2008]

%e If n=0 then C(0+2,2)*C(0+4,2)= C(2,2)*C(4,2)=1*6=6

%e If n=4 then C(4+2,2)*C(4+4,2)= C(6,2)*C(8,2)=15*28=420

%Y Cf. A062196.

%K dead

%O 0,1

%A _Zerinvary Lajos_, May 25 2005