A006236 n^(n-2)*(n+2)^(n-1). (Formerly M3698)

1, 4, 75, 3456, 300125, 42467328, 8931928887, 2621440000000, 1025271882697689, 515978035200000000, 325063112540091870659, 250738401558910243700736, 232526248038920243408203125, 255326682647558617373989666816, 327696095670976278474202880859375, 486146690661928563361690196851556352

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