|
Search: id:A011820
|
|
|
| A011820 |
|
M-sequences m_0,...,m_4 with m_1 < n. |
|
+0
5
|
|
| 2, 6, 32, 203, 1144, 5345, 20926, 70506, 209746, 562727, 1384758, 3167606, 6807620, 13863904, 26941700, 50245591, 90358146, 157312324, 266040452, 438299013, 705186944, 1110395771, 1714352818, 2599444040, 3876530866
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
REFERENCES
|
S. Linusson, The number of M-sequences and f-vectors, Combinatorica, 19 (1999), 255-266.
|
|
FORMULA
|
a(n)= ( 4*n^10 +61*n^9 +408*n^8 +1722*n^7 +6132*n^6 +18333*n^5 +41072*n^4 +88748*n^3 +133824*n^2 +193536*n +241920 )/120960, (frank.ellermann(AT)t-online.de).
|
|
CROSSREFS
|
Cf. A011819 ... A011825, A011828.
Adjacent sequences: A011817 A011818 A011819 this_sequence A011821 A011822 A011823
Sequence in context: A018940 A055596 A109572 this_sequence A111550 A009686 A012318
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Svante Linusson (linusson(AT)math.kth.se)
|
|
|
Search completed in 0.002 seconds
|
