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A006236 n^(n-2)*(n+2)^(n-1).
(Formerly M3698)
1
1, 4, 75, 3456, 300125, 42467328, 8931928887, 2621440000000, 1025271882697689, 515978035200000000, 325063112540091870659, 250738401558910243700736, 232526248038920243408203125, 255326682647558617373989666816, 327696095670976278474202880859375, 486146690661928563361690196851556352 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

G. Kreweras, Complexite et circuits Euleriens dans les sommes tensorielles de graphes, J. Combin. Theory, B 24 (1978), 202-212.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

T. D. Noe, Table of n, a(n) for n = 1..100

MATHEMATICA

Table[n^(n - 2)*(n + 2)^(n - 1), {n, 20}] (* T. D. Noe, May 29 2012 *)

CROSSREFS

Sequence in context: A006412 A206456 A137220 * A120248 A191505 A100323

Adjacent sequences:  A006233 A006234 A006235 * A006237 A006238 A006239

KEYWORD

nonn

AUTHOR

N. J. A. Sloane. Clarified definition, added more terms, May 27 2012.

STATUS

approved

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Last modified October 24 19:11 EDT 2020. Contains 338009 sequences. (Running on oeis4.)