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Search: id:A068944
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| 0, 0, 0, 2, 7, 28, 108, 414, 1585, 6087, 23446, 90532, 350343, 1358437, 5276545, 20527950, 79976007, 311984922, 1218474389, 4763911699, 18643889114, 73029856058, 286302435505, 1123267533520, 4410123312095, 17326303720537
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OFFSET
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1,4
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COMMENT
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Sequence was suggested by the discovery that the digital root of A068943 is 9 for all n>3.
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EXAMPLE
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a(11)=23446 since f(11,11,11)=9^binomial(12,10) * 6^binomial(15,10) * 3^(18,10) * other terms. this implies a(11)=binomial(12,10) + 1/2*(binomial(15,10)-1 + binomial(18,10)).
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CROSSREFS
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Cf. A068943, A068945.
Sequence in context: A048504 A092465 A099488 this_sequence A012855 A150646 A128611
Adjacent sequences: A068941 A068942 A068943 this_sequence A068945 A068946 A068947
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KEYWORD
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nonn
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AUTHOR
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Francois Jooste (phukraut(AT)hotmail.com), Mar 09 2002
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