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A147304
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a(n) = Sum_{k=1..prime(n)^2-1} binomial(2k,k).
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2
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28, 17576, 43308802158650, 8610524734277600186228691452, 121374542758943982922417964798154019940274699584207321286055873543631298, 8126392396649531937838689708830356413772063825711016912849229977138431439363305375418692100492504264
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Table[Sum[Binomial[2k, k], {k, Prime[n]^2-1}], {n, 7}] (* Harvey P. Dale, Dec 26 2014 *)
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PROG
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(PARI) a(n) = sum(k=1, prime(n)^2-1, binomial(2*k, k)); \\ Michel Marcus, Jul 07 2018
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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