|
|
A238959
|
|
The number of arcs from even to odd level vertices in divisor lattice in graded colexicographic order.
|
|
3
|
|
|
0, 1, 1, 2, 2, 4, 6, 2, 5, 6, 10, 16, 3, 7, 9, 14, 17, 26, 40, 3, 8, 11, 12, 18, 23, 27, 36, 42, 64, 96, 4, 10, 14, 16, 22, 30, 32, 38, 46, 58, 68, 88, 102, 152, 224, 4, 11, 16, 19, 20, 26, 36, 41, 48, 52, 56, 74, 80, 93, 108, 112, 140, 162, 208, 240, 352, 512
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,4
|
|
LINKS
|
|
|
FORMULA
|
|
|
EXAMPLE
|
Triangle T(n,k) begins:
0;
1;
1, 2;
2, 4, 6;
2, 5, 6, 10, 16;
3, 7, 9, 14, 17, 26, 40;
3, 8, 11, 12, 18, 23, 27, 36, 42, 64, 96;
...
|
|
CROSSREFS
|
Cf. A238950 in graded colexicographic order.
|
|
KEYWORD
|
nonn,tabf
|
|
AUTHOR
|
|
|
EXTENSIONS
|
Offset changed and terms a(50) and beyond from Andrew Howroyd, Apr 25 2020
|
|
STATUS
|
approved
|
|
|
|