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 A341330 a(n) = Sum_{k=1..n} (-k)^(k+1). 0
 1, -7, 74, -950, 14675, -265261, 5499540, -128718188, 3358066213, -96641933787, 3041786442934, -103951418936138, 3833424966763151, -151734670591049073, 6416673685121841552, -288731231494230984304, 13774353220573494006705, -694460992134764182350927 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS MATHEMATICA Accumulate[(-#)^(#+1)&/@Range[17]] PROG (PARI) a(n) = sum(i=1, n, (-i)^(i+1)); (Python) sum = 0 for i in range(1, 20):     sum += (-i)**(i+1)     print(sum, end = ", ") CROSSREFS Cf. A007778, A062815. Sequence in context: A114472 A000901 A295245 * A266305 A098118 A097821 Adjacent sequences:  A341327 A341328 A341329 * A341331 A341332 A341333 KEYWORD sign AUTHOR John H. Chakkour, Feb 09 2021 STATUS approved

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Last modified May 21 03:31 EDT 2022. Contains 353887 sequences. (Running on oeis4.)