|
Search: id:A102345
|
|
| |
|
| 2, 2, 10, 26, 82, 242, 730, 2186, 6562, 19682, 59050, 177146, 531442, 1594322, 4782970, 14348906, 43046722, 129140162, 387420490, 1162261466, 3486784402, 10460353202, 31381059610, 94143178826, 282429536482, 847288609442
(list; graph; listen)
|
|
|
OFFSET
|
0,1
|
|
|
COMMENT
|
a(n)=A105723(n)+2*(-1)^n; (a(n)+A105723(n))/2=A000244(n). - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 18 2005
|
|
FORMULA
|
a(n)=3a(n-2)+2a(n-1).
|
|
MAPLE
|
g:=1/(1+3*z): gser:=series(g, z=0, 43): seq(abs(coeff(gser, z, n)+1), n=0..31); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 09 2009]
|
|
PROGRAM
|
(Other) sage: [lucas_number2(n, 2, -3) for n in xrange(0, 26)]# [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Apr 30 2009]
|
|
CROSSREFS
|
Apart from leading term, same as A084182.
Sequence in context: A151456 A151389 A151428 this_sequence A151364 A001885 A078433
Adjacent sequences: A102342 A102343 A102344 this_sequence A102346 A102347 A102348
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
Graeme McRae (g_m(AT)mcraefamily.com), Feb 16 2005
|
|
|
Search completed in 0.002 seconds
|
