id:A053553 - OEIS Search Results

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Extreme points of set of n X n symmetric substochastic matrices.

+0
2

1, 2, 5, 15, 51, 204, 933, 5115, 32385, 245214, 2090961, 20648547, 221781915, 2679261840, 34419818241, 488332067679, 7271691132033, 118162937240730, 1998172269602685, 36552556172242359, 691550102624919651, 14056929989746659252 (list; graph; listen)

	OFFSET	`0,2`
	REFERENCES	`R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see Problem 5.25(b).`
	FORMULA	`E.g.f.: exp(x)((1+x)/(1-x))^(1/4)exp(1/2x+1/2x^2).`
	CROSSREFS	`Cf. A006847.` `Sequence in context: A108307 A117426 A001681 this_sequence A007312 A007296 A056272` `Adjacent sequences: A053550 A053551 A053552 this_sequence A053554 A053555 A053556`
	KEYWORD	`nonn,easy,nice`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Jan 16 2000`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

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