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A284737 A condensed version of A108235. 0
1, 1, 8, 21, 3040, 20505, 10567748, 103372655 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Lists only the terms A108235(n) for n == 0 or 3 mod 12.

See A108235, the main entry for this sequence, for more information.

LINKS

Table of n, a(n) for n=1..8.

R. J. Nowakowski, Generalizations of the Langford-Skolem problem, M.S. Thesis, Dept. Math., Univ. Calgary, May 1975. [Scanned copy, with permission.]

Ana Rechtman, Août 2018, 3e défi, Images des Mathématiques, CNRS, 2018 (in French).

CROSSREFS

Cf. A108235.

Sequence in context: A141369 A060390 A019281 * A013630 A215600 A304301

Adjacent sequences:  A284734 A284735 A284736 * A284738 A284739 A284740

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Apr 09 2017

STATUS

approved

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Last modified April 19 16:18 EDT 2019. Contains 322282 sequences. (Running on oeis4.)