|
| |
|
|
A011819
|
|
M-sequences m_0,m_1,m_2,m_3 with m_1 < n.
|
|
5
|
|
|
|
2, 5, 16, 52, 152, 392, 904, 1899, 3694, 6743, 11672, 19318, 30772, 47426, 71024, 103717, 148122, 207385, 285248, 386120, 515152, 678316, 882488, 1135535, 1446406, 1825227, 2283400, 2833706, 3490412, 4269382, 5188192, 6266249
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
REFERENCES
|
S. Linusson, The number of M-sequences and f-vectors, Combinatorica, 19 (1999), 255-266.
|
|
|
LINKS
|
Table of n, a(n) for n=1..32.
Index to sequences with linear recurrences with constant coefficients, signature (7,-21,35,-35,21,-7,1).
|
|
|
FORMULA
|
a(n)= ( 2*n^6 +15*n^5 +50*n^4 +165*n^3 +308*n^2 +540*n +720 )/360. [Frank Ellermann]
|
|
|
PROG
|
(PARI) a(n)=n*(2*n^5+15*n^4+50*n^3+165*n^2+308*n+540)/360+2 \\ Charles R Greathouse IV, Dec 08 2011
|
|
|
CROSSREFS
|
Cf. A011820-A011825, A011827.
Sequence in context: A148388 A148389 A108529 * A148390 A148391 A148392
Adjacent sequences: A011816 A011817 A011818 * A011820 A011821 A011822
|
|
|
KEYWORD
|
nonn,easy,changed
|
|
|
AUTHOR
|
Svante Linusson (linusson(AT)math.kth.se)
|
|
|
STATUS
|
approved
|
| |
|
|
