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M. Michael Somos, <a href="/A010815/a010815.txt">Introduction to Ramanujan theta functions</a>
M. Somos, <a href="http://somos.crg4.comA010815/multiqa010815.htmltxt
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M. Somos, <a href="http://somos.crg4.com/multiq.pdfhtml">Introduction to Ramanujan theta functions</a>
Euler transform of period 28 sequence [ 1, -1, 1, 0, 1, -1, 2, 0, 1, -1, 1, 0, 1, -2, 1, 0, 1, -1, 1, 0, 2, -1, 1, 0, 1, -1, 1, 0, ...]. - Michael Somos, Dec 03 2013
(PARI) {a(n) = my(A); if( n<-1, 0, n++; 0, A = x * O(x^n); polcoeff( eta(x^2 + A)^2 * eta(x^14 + A)^2 / (eta(x + A) * eta(x^4 + A) * eta(x^7 + A) * eta(x^28 + A)), n))}; /* Michael Somos, Dec 03 2013 */
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M. Somos, <a href="http://cis.csuohio.edu/~somos.crg4.com/multiq.pdf">Introduction to Ramanujan theta functions</a>
D. Ford, J. McKay and S. P. Norton, More on replicable functions, Commun. Algebra 22, No. 13, 5175-5193 (1994).
D. Ford, J. McKay and S. P. Norton, <a href="http://dx.doi.org/10.1080/00927879408825127">More on replicable functions</a>, Commun. Algebra 22, No. 13, 5175-5193 (1994).
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