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A172985 Triangle T(n,m) = A049614(n)/ (A049614(m)*A049614(n-m)) read by rows. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 4, 4, 1, 1, 1, 4, 4, 1, 1, 1, 6, 6, 24, 6, 6, 1, 1, 1, 6, 6, 6, 6, 1, 1, 1, 8, 8, 48, 12, 48, 8, 8, 1, 1, 9, 72, 72, 108, 108, 72, 72, 9, 1, 1, 10, 90, 720, 180, 1080, 180, 720, 90, 10, 1, 1, 1, 10, 90, 180, 180, 180, 180, 90, 10, 1, 1, 1, 12, 12, 120, 270 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
0,12
COMMENTS
Row sums are: 1, 2, 3, 4, 14, 12, 50, 28, 142, 524, 3082,...
LINKS
EXAMPLE
1;
1, 1;
1, 1, 1;
1, 1, 1, 1;
1, 4, 4, 4, 1;
1, 1, 4, 4, 1, 1;
1, 6, 6, 24, 6, 6, 1;
1, 1, 6, 6, 6, 6, 1, 1;
1, 8, 8, 48, 12, 48, 8, 8, 1;
1, 9, 72, 72, 108, 108, 72, 72, 9, 1;
1, 10, 90, 720, 180, 1080, 180, 720, 90, 10, 1;
MATHEMATICA
c[n_] := Product[If[i == 0, 1, If[PrimeQ[i], 1, i]], {i, 0, n}];
t[n_, m_] := c[n]/(c[m]*c[n - m]);
Table[Table[t[n, m], {m, 0, n}], {n, 0, 10}];
Flatten[%]
CROSSREFS
Sequence in context: A052283 A133889 A243756 * A117683 A172088 A159891
KEYWORD
nonn,tabl,easy
AUTHOR
Roger L. Bagula, Feb 06 2010
EXTENSIONS
Definition simplified by the Assoc. Editors of the OEIS, Mar 05 2010
STATUS
approved

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Last modified March 28 12:26 EDT 2024. Contains 371254 sequences. (Running on oeis4.)