1,3

Equals row sums of triangle A143442

First four terms = (1, 0, -3, -4) = (1*1, 2*0, 3*(-1), 4*(-1)), where the Mertens function A002321 = (1, 0, -1, -1, -2, -1, -2, -2, -2,...)

a(5) = -10 = sum of row 5 terms of triangle A143442: (5 - 5 - 5 + 0 - 5).

Cf. A002321, A143442.

Sequence in context: A073015 A063930 A014411 this_sequence A139556 A023896 A128488

Adjacent sequences: A143440 A143441 A143442 this_sequence A143444 A143445 A143446

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Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 15 2008