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 A071059 Number of ways of pairing even numbers in the range 1 to n with odd numbers in the range n+1 to 2n such that each pair sums to a prime. 2
 1, 1, 1, 1, 1, 2, 2, 6, 4, 7, 6, 11, 11, 53, 53, 181, 171, 939, 925, 4432, 4545, 15811, 15583, 67891, 68193, 434963, 388975, 2718150, 3113343, 21580655, 18425145, 92370364, 94887088, 564878656, 572364768, 4545704064, 4092294083 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,6 LINKS FORMULA a(2n) = A071058(2n). EXAMPLE a(6)=2 because there are two ways: 2+9, 4+7, 6+11 and 2+11, 4+9, 6+7. CROSSREFS The product of this sequence and A071058 gives A070897. Sequence in context: A067804 A074911 A174222 * A256468 A061108 A284918 Adjacent sequences:  A071056 A071057 A071058 * A071060 A071061 A071062 KEYWORD nice,nonn AUTHOR T. D. Noe, May 25 2002 EXTENSIONS More terms from David W. Wilson, May 27 2002 a(31)-a(37) from Donovan Johnson, Aug 12 2010 STATUS approved

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Last modified April 20 06:59 EDT 2021. Contains 343125 sequences. (Running on oeis4.)