OFFSET
0,6
COMMENTS
A sequence B is called a reluctant sequence of sequence A, if B is triangle array read by rows: row number k coincides with first k elements of the sequence A. Sequence A140531 is the reluctant sequence of A131577. - Boris Putievskiy, Dec 12 2012
LINKS
Boris Putievskiy, Transformations Integer Sequences And Pairing Functions, arXiv:1212.2732 [math.CO], 2012.
FORMULA
a(n) = floor(2^(n-2-t*(t+1)/2)), where t=floor((-1+sqrt(8*n-7))/2), n>=1. - Boris Putievskiy, Dec 13 2012
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Paul Curtz, Jul 03 2008
STATUS
approved