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0,2
Equals unsigned column 2 of triangle A137156.
Table of n, a(n) for n=0..13.
(PARI) {a(n)=polcoeff(1-sum(k=0, n-1, a(k)*x^k/(1+x+x*O(x^n))^(2^(k+2)) ), n)}
Cf. A137156; A001192, A137157, A137159, A137160.
Sequence in context: A197963 A260296 A302769 * A025135 A125801 A195227
Adjacent sequences: A137155 A137156 A137157 * A137159 A137160 A137161
nonn
Paul D. Hanna, Jan 24 2008
approved