|
Search: id:A033580
|
|
|
| A033580 |
|
Four times second pentagonal numbers: 2*n*(3*n+1). |
|
+0
4
|
|
| 0, 8, 28, 60, 104, 160, 228, 308, 400, 504, 620, 748, 888, 1040, 1204, 1380, 1568, 1768, 1980, 2204, 2440, 2688, 2948, 3220, 3504, 3800, 4108, 4428, 4760, 5104, 5460, 5828, 6208, 6600, 7004, 7420, 7848
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
FORMULA
|
a(n)=12*n+a(n-1)-16 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 12 2009]
|
|
EXAMPLE
|
For n=2, a(2)=12*2+0-16=8; n=3, a(3)=12*3+8-16=28; n=4, a(4)=12*4+28-16=60 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 12 2009]
|
|
MATHEMATICA
|
s=0; lst={s}; Do[s+=n++ +8; AppendTo[lst, s], {n, 0, 8!, 12}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 16 2008]
|
|
CROSSREFS
|
Cf. A049451, A045945, A033579.
Sequence in context: A009504 A001486 A045850 this_sequence A007331 A002408 A101127
Adjacent sequences: A033577 A033578 A033579 this_sequence A033581 A033582 A033583
|
|
KEYWORD
|
nonn,new
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com).
|
|
|
Search completed in 0.002 seconds
|
