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A196197 Successive values of variable in iterative system. See formula. 1
1, 2, 46, 9524, 668167328, 2659622445121618432, 49010511918326168029213178565961711616, 16062797652514333892481251366398766288832009528055271611504951962161641422848 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..8.

FORMULA

Successive values of e in iterative system (LHS subscript for a-e is _n+1, RHS subscript for a-e is _n): a = 2ad + bd; b = 2ae + bd + be + 2cd + ce; c = be + ce; d = 2ad + 2ae + bd + be + ce; e = bd + be + 2cd + ce. The initial values for the system are a=b=d=e=1, c=0.

PROG

(PARI) v=[1, 1, 0, 1, 1]; for(n=1, 10, a=v[1]; b=v[2]; c=v[3]; d=v[4]; e=v[5]; print1(e", "); v=[2*a*d+b*d, 2*a*e+b*d+b*e+2*c*d+c*e, b*e+c*e, 2*a*d+2*a*e+b*d+b*e+c*e, b*d+b*e+2*c*d+c*e]) \\ Charles R Greathouse IV, Sep 29 2011

CROSSREFS

Sequence in context: A277554 A000191 A000192 * A273380 A124690 A195877

Adjacent sequences:  A196194 A196195 A196196 * A196198 A196199 A196200

KEYWORD

nonn

AUTHOR

Daniel Tisdale, Sep 29 2011

STATUS

approved

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Last modified September 28 02:29 EDT 2020. Contains 337392 sequences. (Running on oeis4.)