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A110613 a(n+3) = 5*a(n+2) - 2*a(n+1) - 8*a(n), a(0) = 1, a(1) = 0, a(2) = 3. 1
1, 0, 3, 7, 29, 107, 421, 1659, 6597, 26299, 105029, 419771, 1678405, 6712251, 26846277, 107379643, 429507653, 1718008763, 6871991365, 27487878075, 109951337541, 439805000635, 1759219303493, 7036875815867, 28147500467269 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

A Jacobsthal related sequence (A001045). This sequence was calculated using the same rules given for A108618; the "initial seed" is the floretion given in the program code, below.

LINKS

Table of n, a(n) for n=0..24.

FORMULA

G.f. (1-5*x+5*x^2)/((4*x-1)*(2*x-1)*(x+1)); Program "Superseeker" finds: a(n) + a(n+1) = A007582(n) = A007581(n+1) - A007581(n); a(n+2) - a(n) = A049775(n); a(n) + 2*a(n+1) + a(n+2) = A087440(n+1);

MAPLE

seriestolist(series((1-5*x+5*x^2)/((4*x-1)*(2*x-1)*(x+1)), x=0, 25)); -or- Floretion Algebra Multiplication Program, FAMP Code: 2tessumseq[(.5'i - .5'k - .5i' + .5k' - .5'ij' - .5'ji' - .5'jk' - .5'kj')('i + j' + 'ij' + 'ji')] Sumtype is set to:sum[Y[15]] = sum(*) (from 3rd term, disregarding signs)

CROSSREFS

Cf. A001045, A007582, A007581, A049775, A087440, A108618, A110614.

Sequence in context: A148767 A171180 A151358 * A088095 A217576 A173280

Adjacent sequences:  A110610 A110611 A110612 * A110614 A110615 A110616

KEYWORD

easy,nonn

AUTHOR

Creighton Dement, Jul 31 2005

STATUS

approved

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Last modified March 30 15:48 EDT 2017. Contains 284302 sequences.