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A238958 The number of nodes at odd level in divisor lattice in graded colexicographic order. 1
0, 1, 1, 2, 2, 3, 4, 2, 4, 4, 6, 8, 3, 5, 6, 8, 9, 12, 16, 3, 6, 7, 8, 10, 12, 13, 16, 18, 24, 32, 4, 7, 9, 10, 12, 15, 16, 18, 20, 24, 27, 32, 36, 48, 64, 4, 8, 10, 12, 12 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..50.

S.-H. Cha, E. G. DuCasse, and L. V. Quintas, Graph Invariants Based on the Divides Relation and Ordered by Prime Signatures, arxiv:1405.5283

CROSSREFS

Cf. A056924 in graded colexicographic order.

Sequence in context: A098223 A114892 A285705 * A238971 A194331 A290600

Adjacent sequences:  A238955 A238956 A238957 * A238959 A238960 A238961

KEYWORD

nonn

AUTHOR

Sung-Hyuk Cha, Mar 07 2014

STATUS

approved

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Last modified July 24 03:01 EDT 2019. Contains 325290 sequences. (Running on oeis4.)