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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

Table of n, a(n) for n=1..37.

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 September 25 12:03 EDT 2020. Contains 337343 sequences. (Running on oeis4.)