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 A131588 Interlaces A007583 with A083420 (related to Jacobsthal sequence A001045). 0

%I

%S 1,1,3,7,11,31,43,127,171,511,683,2047,2731,8191,10923,32767,43691,

%T 131071,174763,524287,699051,2097151,2796203,8388607,11184811,

%U 33554431,44739243,134217727,178956971,536870911,715827883,2147483647,2863311531

%N Interlaces A007583 with A083420 (related to Jacobsthal sequence A001045).

%F a(n) = 5*a(n-2) - 4*a(n-4); a(n) = (5*2^n+(-2)^n-8*(-1)^n-4)/12; g.f. (1+x-2*x^2+2*x^3)/((x-1)*(2*x+1)*(2*x-1)*(x+1))

%o Floretion Algebra Multiplication Program, FAMP Code: minseq[A*B] with A = + .25'i + .25i' + .25'ii' + .25'jj' + .25'kk' + .25'jk' + .25'kj' + .25e and B = + 'i + 'j - 2'k (apart from initial term and signs)

%Y Cf. A007583, A083420, A001045.

%K easy,nonn

%O 0,3

%A _Creighton Dement_, Aug 30 2007

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Last modified February 22 09:43 EST 2019. Contains 320390 sequences. (Running on oeis4.)