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Search: id:A011820
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| A011820 |
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M-sequences m_0,...,m_4 with m_1 < n. |
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+0
5
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| 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)
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OFFSET
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1,1
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REFERENCES
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S. Linusson, The number of M-sequences and f-vectors, Combinatorica, 19 (1999), 255-266.
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FORMULA
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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).
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CROSSREFS
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Cf. A011819 ... A011825, A011828.
Sequence in context: A018940 A055596 A109572 this_sequence A111550 A009686 A012318
Adjacent sequences: A011817 A011818 A011819 this_sequence A011821 A011822 A011823
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KEYWORD
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nonn
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AUTHOR
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Svante Linusson (linusson(AT)math.kth.se)
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