|
Search: id:A152750
|
|
|
| A152750 |
|
8 times hexagonal numbers: 8n(2n-1). |
|
+0
2
|
|
| 0, 8, 48, 120, 224, 360, 528, 728, 960, 1224, 1520, 1848, 2208, 2600, 3024, 3480, 3968, 4488, 5040, 5624, 6240, 6888, 7568, 8280, 9024, 9800, 10608, 11448, 12320, 13224, 14160, 15128, 16128, 17160, 18224, 19320, 20448, 21608, 22800, 24024
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
COMMENT
|
Equals Engel expansion of cosh(1/2), except first member (See A067239).
|
|
FORMULA
|
a(n) = 16n^2 - 8n = A000384(n)*8 = A002939(n)*4 = A085250(n)*2.
a(n) = A067239(n), for n>0.
a(n)=32*n+a(n-1)-56 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 15 2009]
|
|
EXAMPLE
|
For n=2, a(2)=32*2+0-56=8; n=3, a(3)=32*3+8-56=48; n=4, a(4)=32*4+48-56=120 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 15 2009]
|
|
CROSSREFS
|
Cf. A000384, A002939, A067239, A085250, A152747.
Sequence in context: A121028 A139279 A067239 this_sequence A121355 A035471 A072819
Adjacent sequences: A152747 A152748 A152749 this_sequence A152751 A152752 A152753
|
|
KEYWORD
|
easy,nonn,new
|
|
AUTHOR
|
Omar E. Pol (info(AT)polprimos.com), Dec 12 2008
|
|
|
Search completed in 0.002 seconds
|
