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A132833 Largest terms a(n) forming a self-convolution of an integer sequence (A132834) such that: a(n) <= 3*a(n-1) for n>0 with a(0)=1. 1
1, 2, 5, 14, 42, 126, 377, 1130, 3390, 10170, 30509, 91526, 274577, 823730, 2471190, 7413570, 22240710, 66722130, 200166390, 600499170, 1801497510, 5404492530, 16213477590, 48640432770, 145921298310, 437763894930, 1313291684789 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
PROG
(PARI) {a(n)=local(B=[1]); if(n==0, 1, for(k=1, n, t=3*a(k-1); B=concat(B, t); B[ #B]=t+1-denominator(Vec(Ser(B)^(1/2))[ #B]) )); B[n+1]}
CROSSREFS
Cf. A132834 (square-root); A132831 (variant).
Sequence in context: A174176 A298367 A025274 * A293347 A148326 A148327
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Sep 07 2007
STATUS
approved

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Last modified February 27 23:21 EST 2024. Contains 370379 sequences. (Running on oeis4.)