|
| |
|
|
A140869
|
|
Triangle read by rows where T(m,n) = floor((2mn+m+n-2)/2), m >= n >= 1.
|
|
2
| |
|
|
1, 2, 5, 4, 7, 11, 5, 10, 14, 19, 7, 12, 18, 23, 29, 8, 15, 21, 28, 34, 41, 10, 17, 25, 32, 40, 47, 55, 11, 20, 28, 37, 45, 54, 62, 71, 13, 22, 32, 41, 51, 60, 70, 79, 89, 14, 25, 35, 46, 56, 67, 77, 88, 98, 109, 16, 27, 39, 50, 62, 73, 85, 96, 108, 119, 131, 17, 30, 42, 55, 67, 80, 92, 105, 117, 130, 142, 15
(list; table; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
EXAMPLE
| Triangle begins:
1
2 5
4 7 11
5 10 14 19
7 12 18 23 29
8 15 21 28 34 41
10 17 25 32 40 47 55
...
|
|
|
MATHEMATICA
| Flatten[Table[Floor[(2*n*m+m+n-2)/2], {n, 1, 10}, {m, n}]] (* From Vladimir Joseph Stephan Orlovsky, Feb 03 2012 *)
|
|
|
CROSSREFS
| Cf. A002327, A153085
Sequence in context: A036237 A015948 A119733 * A111570 A057954 A155896
Adjacent sequences: A140866 A140867 A140868 * A140870 A140871 A140872
|
|
|
KEYWORD
| nonn,tabl,easy,changed
|
|
|
AUTHOR
| Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 16 2009
|
|
|
EXTENSIONS
| All entries were wrong. - N. J. A. Sloane, Jun 23 2010
|
| |
|
|
