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 A235774 Let b(k) = A164555(k)/A027642(k), the sequence of "original" Bernoulli numbers with -1 instead of A164555(0)=1; then a(n) = numerator of the n-th term of the binomial transform of the b(k) sequence. 3
 -1, -1, 1, 1, 59, 3, 169, 5, 179, 7, 533, 9, 26609, 11, 79, 13, 3523, 15, 56635, 17, -168671, 19, 857273, 21, -236304031, 23, 8553247, 25, -23749438409, 27, 8615841677021, 29, -7709321025917, 31, 2577687858559, 33, -26315271552988224913 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 COMMENTS (a(n)/A027642(n)) = -1, -1/2, 1/6, 1, 59/30, 3, 169/42, 5, 179/30, 7, 533/66, 9,.. . Difference table for a(n)/A027642(n): -1, -1/2, 1/6, 1, 59/30, 3, 169/42, ... 1/2, 2/3, 5/6, 29/30, 31/30, 43/42, 41/42, ... = A165161(n)/A051717(n+1) 1/6, 1/6, 2/15, 1/15, -1/105, -1/21, -1/105, ... not in the OEIS 0, -1/30, -1/15, -8/105, -4/105, 4/105, 8/105, ... etc. Compare with the array in A190339. LINKS Table of n, a(n) for n=0..36. FORMULA (a(n+1) - a(n))/A027642(n) = A165161(n)/A051717(n+1). (A164558(n) - a(n))/A027642(n) = 2's = A007395. (a(n) - A164555(n))/A027642(n) = n - 2 = A023444(n). MATHEMATICA b[0] = -1; b[1] = 1/2; b[n_] := BernoulliB[n]; a[n_] := Sum[Binomial[n, k]*b[k], {k, 0, n}] // Numerator; Table[a[n], {n, 0, 40}] (* Jean-François Alcover, Jan 30 2014 *) CROSSREFS Cf. A164558/A027642, A165161(n)/A051717(n+1). Sequence in context: A230852 A104380 A051321 * A088665 A198378 A159250 Adjacent sequences: A235771 A235772 A235773 * A235775 A235776 A235777 KEYWORD sign,frac AUTHOR Paul Curtz, Jan 15 2014 STATUS approved

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Last modified March 5 02:44 EST 2024. Contains 370537 sequences. (Running on oeis4.)