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A032112 "BIJ" (reversible, indistinct, labeled) transform of 2,1,1,1... 1
2, 5, 31, 276, 3111, 42143, 666128, 12033346, 244550149, 5522134317, 137163540306, 3716712490472, 109104171183047, 3449120959632091, 116825788063473052, 4220828797872750510, 162026366682646437513 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..17.

C. G. Bower, Transforms (2)

FORMULA

Numbers so far suggest that a(n) = (A006155(n)+1)/2. - Ralf Stephan, Mar 12 2004

CROSSREFS

Sequence in context: A077483 A119242 A068145 * A058009 A056187 A056790

Adjacent sequences:  A032109 A032110 A032111 * A032113 A032114 A032115

KEYWORD

nonn

AUTHOR

Christian G. Bower

STATUS

approved

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Last modified October 17 16:18 EDT 2018. Contains 316285 sequences. (Running on oeis4.)