|
| |
| |
|
|
|
0, 0, 4, 20, 72, 232, 716, 2172, 6544, 19664, 59028, 177124, 531416, 1594296, 4782940, 14348876, 43046688, 129140128, 387420452, 1162261428, 3486784360, 10460353160, 31381059564, 94143178780, 282429536432, 847288609392
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
0,3
|
|
|
LINKS
|
Harry J. Smith, Table of n, a(n) for n = 0..200
Index to sequences with linear recurrences with constant coefficients, signature (5,-7,3).
|
|
|
FORMULA
|
Contribution from Bruno Berselli, Jan 31 2012: (Start)
G.f.: 4*x^2/((1-3*x)*(1-x)^2).
a(n) = A186948(n)-1.
a(n+2) = 4*A000340(n). (End)
|
|
|
PROG
|
(PARI) { for (n=0, 200, write("b061981.txt", n, " ", 3^n - 2*n - 1) ) } [From Harry J. Smith, Jul 29 2009]
|
|
|
CROSSREFS
|
Column of A061980.
Sequence in context: A123613 A006740 A197426 * A054611 A196432 A196508
Adjacent sequences: A061978 A061979 A061980 * A061982 A061983 A061984
|
|
|
KEYWORD
|
nonn,easy
|
|
|
AUTHOR
|
Henry Bottomley, May 24 2001
|
|
|
STATUS
|
approved
|
| |
|
|
