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 A082459 Multiply by 1, add 1, multiply by 2, add 2, etc. 2
 -1, -1, 0, 0, 2, 6, 9, 36, 40, 200, 205, 1230, 1236, 8652, 8659, 69272, 69280, 623520, 623529, 6235290, 6235300, 68588300, 68588311, 823059732, 823059744, 10699776672, 10699776685, 149796873590, 149796873604, 2246953104060, 2246953104075, 35951249665200, 35951249665216 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 COMMENTS Bisections: A038156 and A038157. LINKS Robert Israel, Table of n, a(n) for n = 0..898 FORMULA From Robert Israel, Jan 11 2018: (Start) a(2*k) = e*Gamma(k+1,1) - k! - 1. a(2*k+1) = e*Gamma(k+2,1) - (k+1)! - k - 2. (End) MAPLE seq(op(simplify([exp(1)*GAMMA(k+1, 1)-k!-1, exp(1)*GAMMA(k+2, 1)-(k+1)!-k-2])), k=0..20); # Robert Israel, Jan 11 2018 MATHEMATICA FoldList[If[OddQ@ #2, #1 ((#2 + 1)/2), #1 + #2/2] &, -1, Range@ 31] (* Michael De Vlieger, Jan 11 2018 *) CROSSREFS Cf. A019464 - A019466. Sequence in context: A101823 A242421 A093397 * A129831 A101713 A240761 Adjacent sequences:  A082456 A082457 A082458 * A082460 A082461 A082462 KEYWORD sign AUTHOR Vladeta Jovovic, Apr 25 2003 STATUS approved

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Last modified May 26 09:27 EDT 2019. Contains 323579 sequences. (Running on oeis4.)