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A192289 Number of Langford pairings of order n, as n runs through the positive numbers congruent to -1 or 0 mod 4. 1
1, 1, 26, 150, 17792, 108144, 39809640, 326721800, 256814891280, 2636337861200, 3799455942515488, 46845158056515936, 111683611098764903232, 1607383260609382393152 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

See A014552 which is the main entry for this sequence. This is A014552 with the 0's omitted.

REFERENCES

For references, see A014552.

LINKS

Table of n, a(n) for n=1..14.

Ali Assarpour, Amotz Bar-Noy, Ou Liuo, Counting the Number of Langford Skolem Pairings, arXiv:1507.00315 [cs.DM], 2015.

CROSSREFS

Cf. A014552.

Sequence in context: A200449 A248465 A014552 * A230906 A232585 A042314

Adjacent sequences:  A192286 A192287 A192288 * A192290 A192291 A192292

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 03 2011

EXTENSIONS

Corrected and extended using results from the Assarpour et al. (2015) paper by N. J. A. Sloane, Feb 22 2016 at the suggestion of William Rex Marshall.

STATUS

approved

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Last modified November 20 12:37 EST 2018. Contains 317402 sequences. (Running on oeis4.)