|
| |
|
|
A127849
|
|
a(n)=5^C(n,2)*(5^n-1)/4.
|
|
1
| |
|
|
0, 1, 30, 3875, 2437500, 7626953125, 119201660156250, 9313106536865234375, 3637969493865966796875000, 7105423719622194766998291015625, 69388931933644926175475120544433593750
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,3
|
|
|
COMMENTS
| -a(n) is the Hankel transform of A127848, the series reversion of x/(1+6x+5x^2). Note that (5^n-1)/4 has g.f. x/(1-6x+5x^2).
(-1)^n*a(n) is the Hankel transform of the series reversion of x(1+4x)/(1+2x-3x^2). - Paul Barry (pbarry(AT)wit.ie), Jul 12 2008
|
|
|
CROSSREFS
| Sequence in context: A152131 A159993 A153470 * A166845 A166834 A196466
Adjacent sequences: A127846 A127847 A127848 * A127850 A127851 A127852
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Feb 02 2007
|
| |
|
|
