A323284 - OEIS

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A323284

Integral Euler characteristic of the outer automorphism group Out(F_n) of the free group of rank n.

1, 1, 2, 1, 2, 1, 1, -21, -124, -1202 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`2,3`
	LINKS	`Table of n, a(n) for n=2..11.` `Shigeyuki Morita, Takuya Sakasai, and Masaaki Suzuki, Integral Euler characteristic of Out(F_11), arXiv:1405.4063 [math.AT], 2014. See Table 3.`
	CROSSREFS	`Sequence in context: A188317 A117354 A140324 * A010250 A268041 A348248` `Adjacent sequences: A323281 A323282 A323283 * A323285 A323286 A323287`
	KEYWORD	`sign,more`
	AUTHOR	`N. J. A. Sloane, Jan 13 2019`
	STATUS	`approved`

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Last modified December 4 22:39 EST 2023. Contains 367565 sequences. (Running on oeis4.)