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Search: id:A083091
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| 1, 5, 17, 49, 128, 321, 790, 1924, 4664, 11282, 27262, 65843, 158988, 383863, 926761, 2237435, 5401685, 13040863, 31483472, 76007871, 183499282, 443006506, 1069512368, 2582031320, 6233575089, 15049181582, 36331938341, 87713058356
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OFFSET
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0,2
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FORMULA
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a(n)=sum(k=0..n, T(k, n-k)), where T(n, 0)=floor(n*x/(x-1))+1, T(n, k+1)=ceil(x*T(n, k)), for n>=0, k>=0, with x=1+sqrt(2).
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CROSSREFS
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Cf. A083087, A083044, A083047, A083050.
Sequence in context: A136303 A006457 A115981 this_sequence A082753 A000337 A086866
Adjacent sequences: A083088 A083089 A083090 this_sequence A083092 A083093 A083094
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Apr 22 2003
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