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a(n)=(prime(n)!+4)/4.
10

%I #5 Jun 20 2012 12:02:24

%S 31,1261,9979201,1556755201,88921857024001,30411275102208001,

%T 6463004184721244160001,2210440498434925488635904000001,

%U 2055709663544480704431390720000001

%N a(n)=(prime(n)!+4)/4.

%t Table[(Prime[n]! + 4)/4, {n, 3, 30}]

%Y Cf. A082672, A089085, A089130, A117141, A007749, A139056-A139066, A020458, A139068, A137390, A139070-A139075, A139148-A139157, A139159, A139160-A139166, A139089, A139168-A139170.

%K nonn

%O 3,1

%A _Artur Jasinski_, Apr 11 2008