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A326501 a(n) = Sum_{k=0..n} (-k)^k. 1
1, 0, 4, -23, 233, -2892, 43764, -779779, 15997437, -371423052, 9628576948, -275683093663, 8640417354593, -294234689237660, 10817772136320356, -427076118244539019, 18019667955465012597, -809220593930871751580, 38537187481365665823844 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..386

FORMULA

a(n) = 1 + (-1)^n * A001099(n).

MAPLE

a:= proc(n) option remember; `if`(n<0, 0, (-n)^n+a(n-1)) end:

seq(a(n), n=0..23);  # Alois P. Heinz, Sep 12 2019

PROG

(PARI) {a(n) = sum(k=0, n, (-k)^k)}

CROSSREFS

Cf. A001099, A062970, A177885.

Sequence in context: A306152 A292312 A316083 * A123637 A293510 A234595

Adjacent sequences:  A326498 A326499 A326500 * A326502 A326503 A326504

KEYWORD

sign,easy

AUTHOR

Seiichi Manyama, Sep 12 2019

STATUS

approved

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Last modified January 24 16:47 EST 2020. Contains 331209 sequences. (Running on oeis4.)