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Search: id:A140107
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| 1, 28, 490, 6860, 84035, 941192, 9882516, 98825160, 951192165, 8877793540, 80787921214, 719746934452, 6297785676455, 54257845827920, 461191689537320, 3874010192113488, 32202709721943369, 265198785945415980
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OFFSET
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0,2
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COMMENT
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With a different offset, number of n-permutations (n=4) of 8 objects: s, t, u, v, w, z, x, y with repetition allowed, containing exactly three u's.
uuus, uusu, usuu, suuu,
uuut, uutu, utuu, tuuu,
uuuv, uuvu, uvuu, vuuu,
uuuw, uuwu, uwuu, wuuu,
uuuz, uuzu, uzuu, zuuu,
uuux, uuxu, uxuu, xuuu,
uuuy, uuyu, uyuu, yuuu
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MAPLE
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seq(binomial(n+3, 3)*7^n, n=0..26);
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CROSSREFS
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Sequence in context: A115226 A086782 A115225 this_sequence A028170 A076172 A004336
Adjacent sequences: A140104 A140105 A140106 this_sequence A140108 A140109 A140110
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KEYWORD
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nonn
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AUTHOR
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Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 03 2008
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