id:A072827 - OEIS Search Results

Search: id:A072827

Displaying 1-1 of 1 results found.

page 1

Number of permutations satisfying i-2<=p(i)<=i+3, i=1..n.

+0
67

1, 2, 6, 18, 46, 115, 301, 792, 2068, 5380, 14020, 36581, 95413, 248786, 648714, 1691686, 4411530, 11503991, 29998953, 78228640, 203998184, 531969064, 1387222648, 3617479225, 9433351129, 24599481138, 64148406350, 167280683834 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`Recurrence: a(n) = a(n-1)+2a(n-2)+3a(n-3)+5a(n-4)+6a(n-5)-a(n-6)-a(n-7)-a(n-9)-a(n-10). G.f.: (x^5+x^3+x^2-1)/(x^10+x^9+x^7+x^6-6x^5-5x^4-3x^3-2x^2-x+1).`
	CROSSREFS	`Cf. A000045, A000073, A002524, A002526.` `Sequence in context: A027556 A120414 A054136 this_sequence A002529 A018027 A059413` `Adjacent sequences: A072824 A072825 A072826 this_sequence A072828 A072829 A072830`
	KEYWORD	`nonn`
	AUTHOR	`Vladimir Baltic (baltic(AT)galeb.etf.bg.ac.yu), Jul 21 2002`

page 1

Search completed in 0.002 seconds

Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research