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A281350
Triangle read by rows: number of topologies of n nested circles intersecting at most as triples, according to number of factors.
1
1, 2, 1, 11, 2, 1, 44, 14, 2, 1, 169, 66, 14, 2, 1, 609, 323, 70, 14, 2, 1, 2253, 1431, 356, 70, 14, 2, 1, 8779, 6320, 1695, 361, 70, 14, 2, 1, 36319, 27420, 8081, 1739, 361, 70, 14, 2, 1, 157297, 119821, 37849, 8455, 1745, 361, 70, 14, 2, 1, 701901, 528557, 176894, 40549, 8510, 1745, 361, 70, 14, 2, 1
OFFSET
1,2
EXAMPLE
Triangle begins:
1,
2,1,
11,2,1,
44,14,2,1,
169,66,14,2,1,
609,323,70,14,2,1,
2253,1431,356,70,14,2,1,
8779,6320,1695,361,70,14,2,1,
36319,27420,8081,1739,361,70,14,2,1,
...
CROSSREFS
Row sums give A281349.
Sequence in context: A292355 A262181 A309497 * A252158 A285996 A191618
KEYWORD
nonn,tabl
AUTHOR
N. J. A. Sloane, Jan 20 2017
STATUS
approved