The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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 Adjacent sequences:  A172982 A172983 A172984 * A172986 A172987 A172988 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 5 15:20 EDT 2020. Contains 334850 sequences. (Running on oeis4.)