

A078925


Triangle of T1(n,m) = number of bracelets (necklaces that can be turned over) with m white beads and (2n+1m) black ones, for 1<=m<=n.


1



1, 1, 2, 1, 3, 4, 1, 4, 7, 10, 1, 5, 10, 20, 26, 1, 6, 14, 35, 57, 76, 1, 7, 19, 56, 111, 185, 232, 1, 8, 24, 84, 196, 392, 600, 750, 1, 9, 30, 120, 324, 756, 1368, 2052, 2494, 1, 10, 37, 165, 507, 1353, 2829, 4950, 7105, 8524, 1, 11, 44, 220, 759, 2277, 5412, 10824
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OFFSET

1,3


COMMENTS

Left half of odd rows of table A052307 with left column deleted.


LINKS



EXAMPLE

1; 1, 2; 1, 3, 4; 1, 4, 7, 10; ...


MATHEMATICA



CROSSREFS



KEYWORD



AUTHOR

Thomas Hartinger (hartinger_t(AT)web.de), Dec 15 2002


STATUS

approved



