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 A123536 a(0) = 1 and for n>0 a(n) = (-1)^(n+1)*B(2n)*prod(p<=2n+1,p) where B(2n) denotes the (2n)-th Bernoulli number and p is prime. 1
 1, 1, 1, 5, 7, 175, 7601, 35035, 3620617, 533203385, 5132341123, 1381418533495, 19315437152429, 318022715945935, 176611180730425441, 120653354922346558325, 3031735699207849905271, 86163723379372590236285, 101750602671765022556964427, 3623786261867543729253761465 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS MAPLE seq(abs(bernoulli(n)*A034386(n+1)), n=0..38, 2); # Peter Luschny, Oct 02 2017 PROG (PARI) a(n) = if(n==0, 1, (-1)^(n+1)*bernfrac(2*n)*prod(p=1, 2*n+1, if(isprime(p), p, 1))) CROSSREFS Cf. A002445, A034386. Sequence in context: A158969 A083842 A164372 * A057177 A211769 A265031 Adjacent sequences:  A123533 A123534 A123535 * A123537 A123538 A123539 KEYWORD nonn AUTHOR Benoit Cloitre, Nov 11 2006 STATUS approved

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