id:A065506 - OEIS Search Results

Search: id:A065506

Displaying 1-1 of 1 results found.

page 1

Number of (binary) bit strings of length n having an even length block of 0's followed by an odd length block of 1's.

+0
1

1, 2, 7, 15, 39, 84, 196, 419, 928, 1965, 4227, 8871, 18742, 39032, 81481, 168606, 349011, 718371, 1477783, 3028412, 6200296, 12660171, 25823604, 52569417, 106908199, 217086287, 440402878, 892384788, 1806730377, 3654428154 (list; graph; listen)

	OFFSET	`3,2`
	FORMULA	`O.g.f.: x^3/[(1-2x)(1-3x^2-x^3)`
	CROSSREFS	`A065455(n) = 2^n - a(n)` `Sequence in context: A131412 A151998 A052130 this_sequence A121165 A093652 A096690` `Adjacent sequences: A065503 A065504 A065505 this_sequence A065507 A065508 A065509`
	KEYWORD	`nonn`
	AUTHOR	`Len Smiley (smiley(AT)math.uaa.alaska.edu), Nov 26 2001`

page 1

Search completed in 0.002 seconds

Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

AT&T Labs Research