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Search: id:A075506
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| 1, 8, 71, 729, 8842, 125399, 2026249, 36458010, 719866701, 15453821461, 358100141148, 8899677678109, 235877034446341, 6634976621814472, 197269776623577659, 6177654735731310917, 203136983117907790890
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OFFSET
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0,2
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FORMULA
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a(n)=sum((7^(n-m))*S2(n, m), m=1..n), n>=1, with S2(n, m) := A008277(n, m) (Stirling2).
E.g.f.: exp(exp(7*x)-1)/7)-1.
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CROSSREFS
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Cf. A005012, A075507.
Sequence in context: A070998 A081178 A096341 this_sequence A094911 A004165 A032554
Adjacent sequences: A075503 A075504 A075505 this_sequence A075507 A075508 A075509
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KEYWORD
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nonn,easy
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Oct 02, 2002
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