This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A134402 Triangle read by rows, for n>0, n zeros followed by n. 3
 1, 0, 1, 0, 0, 2, 0, 0, 0, 3, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,6 COMMENTS Multiplied by the vector [1, 2, 3,...] from the right gives (1, 2, 6, 12, 20, 30, 42,..., A002378. Triangle T(n,k), read by rows, given by [0,0,0,0,0,0,0,...] DELTA [1,1,-1,1,0,0,0,0,0,...] where DELTA is the operator defined in A084938 . - Philippe DELEHAM, Oct 26 2007 LINKS FORMULA Triangle read by rows, a(0) = 1, then for n>0, n zeros followed by n. Infinite lower triangular matrix with (1, 1, 2, 3, 4,...) in the main diagonal and the rest zeros. EXAMPLE First few rows of the triangle are: 1; 0, 1; 0, 0, 2; 0, 0, 0, 3; 0, 0, 0, 0, 4; 0, 0, 0, 0, 0, 5; ... MATHEMATICA Join[{1}, Flatten[Table[PadLeft[{n}, n+1, 0], {n, 15}]]] (* From Harvey P. Dale, May 08 2012 *) CROSSREFS Cf. A134403, A005449. Sequence in context: A083927 A154724 A218272 * A132440 A174712 A127647 Adjacent sequences:  A134399 A134400 A134401 * A134403 A134404 A134405 KEYWORD nonn,easy,tabl AUTHOR Gary W. Adamson, Oct 23 2007 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .