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 A161801 G.f. is Q_0(q) where Q_0(q^4) is a series quadrisection of the g.f. of A161800. 2
 1, -6, -8, 112, -86, -752, 1360, 1216, -5384, 10762, -8176, -59888, 130160, 47696, -306336, 485952, -632982, -1582304, 4638088, 343120, -6514672, 8034464, -16636656, -20670528, 82724176, 17877578, -114481936, 52539968, -178638656 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS The g.f. of A161800 has two nonzero series quadrisections; the other is given by A161802. LINKS EXAMPLE G.f.: Q_0(q) = 1 - 6*q - 8*q^2 + 112*q^3 - 86*q^4 - 752*q^5 + 1360*q^6 +... PROG (PARI) {a(n)=local(L=sum(m=1, 4*n, 2*2^valuation(m, 2)*sumdiv(m, d, -(-1)^d*d)*x^m/m)+x*O(x^(4*n))); polcoeff(exp(L), 4*n)} CROSSREFS Cf. A161800, A161802. Sequence in context: A013237 A013234 A013240 * A211041 A236754 A069660 Adjacent sequences: A161798 A161799 A161800 * A161802 A161803 A161804 KEYWORD sign AUTHOR Paul D. Hanna, Jul 19 2009 STATUS approved

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Last modified December 8 05:37 EST 2022. Contains 358672 sequences. (Running on oeis4.)