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A130409
Denominators of a-sequence for Sheffer matrix A130191 (Stirling2 squared).
1
1, 1, 3, 4, 15, 3, 84, 3, 5, 20, 33, 6, 5460, 210, 12, 48, 255, 45, 1596, 105, 2310, 1320, 138, 36, 9100, 546, 756, 112, 435, 30, 114576, 42, 58905, 140, 105, 18, 767676, 3458, 16380, 1680, 15785, 385, 132440, 990, 434700, 38640, 3948, 360, 3248700, 99450
OFFSET
0,3
COMMENTS
The numerators are found in A130408.
See the W. Lang link in A130408.
FORMULA
a(n)=denominator(r(n)),n>=0, with the rational r(n) sequence with e.g.f. x/log(1+log(1+x)).
CROSSREFS
Sequence in context: A286081 A286769 A286115 * A365349 A258468 A327275
KEYWORD
nonn,frac,easy
AUTHOR
Wolfdieter Lang Jun 01 2007
STATUS
approved