|
Search: id:A051937
|
|
|
| A051937 |
|
Truncated triangular pyramid numbers: a(n)=sum(k*(k+1)/2-9,k=4..n). |
|
+0
2
|
|
| 1, 7, 19, 38, 65, 101, 147, 204, 273, 355, 451, 562, 689, 833, 995, 1176, 1377, 1599, 1843, 2110, 2401, 2717, 3059, 3428, 3825, 4251, 4707, 5194, 5713, 6265, 6851, 7472, 8129, 8823, 9555, 10326, 11137, 11989, 12883, 13820, 14801, 15827, 16899, 18018
(list; graph; listen)
|
|
|
OFFSET
|
4,2
|
|
|
FORMULA
|
a(n)=1/6*(n-3)*(n^2+6*n-34)
Binomial transform of [1, 6, 6, 1, 0, 0, 0,...]. - Gary W. Adamson (qntmpkt(AT)yahoo.com), Oct 22 2007
|
|
CROSSREFS
|
A000292.
Sequence in context: A121091 A098481 A027452 this_sequence A119327 A099061 A078163
Adjacent sequences: A051934 A051935 A051936 this_sequence A051938 A051939 A051940
|
|
KEYWORD
|
easy,nice,nonn
|
|
AUTHOR
|
Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Dec 21 1999
|
|
|
Search completed in 0.002 seconds
|
