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A052146 floor((sqrt(1+8*n)-3)/2). 1
0, 0, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11 (list; graph; refs; listen; history; internal format)
OFFSET

1,6

REFERENCES

R. P. Stanley, Enumerative Combinatorics, Cambridge, Vol. 2, 1999; see Problem 7.2(d).

CROSSREFS

Sequence in context: A025423 A087233 A104147 * A097882 A108955 A108956

Adjacent sequences:  A052143 A052144 A052145 * A052147 A052148 A052149

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Jan 23 2000

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Last modified February 16 10:32 EST 2012. Contains 205904 sequences.