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A331003 a(n) is the imaginary part of f(n) (as defined in A330779). 2
0, 1, 1, -1, -1, 2, 2, -2, -2, 2, 2, -2, -2, 3, 3, -3, -3, 2, 2, -4, -4, 3, 3, -3, -3, 4, 4, -3, -3, 4, 4, -4, -4, 4, 4, -5, -5, 3, 3, -5, -5, 5, 5, -6, -6, 3, 3, -6, -6, 4, 4, -5, -5, 5, 5, -6, -6, 6, 6, -7, -7, 3, 3, -7, -7, 5, 5, -6, -6, 5, 5, -6, -6, 5, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

LINKS

Rémy Sigrist, Table of n, a(n) for n = 0..10000

Rémy Sigrist, PARI program for A331003

FORMULA

a(2*k+2) = a(2*k+1) for any k >= 0.

a(2*k+1) = a(2*k) + A330779(2*k+1) * (-1)^k for any k >= 0.

PROG

(PARI) See Links section.

CROSSREFS

Cf. A330779.

Sequence in context: A209253 A165113 A069903 * A086007 A108582 A071840

Adjacent sequences:  A331000 A331001 A331002 * A331004 A331005 A331006

KEYWORD

sign

AUTHOR

Rémy Sigrist, Jan 05 2020

STATUS

approved

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Last modified May 31 00:29 EDT 2020. Contains 334747 sequences. (Running on oeis4.)