

A111572


a(n) = a(n1) + a(n3) + a(n4), n >= 4.


5



1, 3, 2, 1, 3, 8, 11, 15, 26, 45, 71, 112, 183, 299, 482, 777, 1259, 2040, 3299, 5335, 8634, 13973, 22607, 36576, 59183, 95763, 154946, 250705, 405651, 656360, 1062011, 1718367, 2780378, 4498749, 7279127, 11777872, 19056999, 30834875, 49891874, 80726745
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OFFSET

0,2


COMMENTS

See comment and FAMP code for A111569.


LINKS

Table of n, a(n) for n=0..39.


FORMULA

G.f. (14*x+x^2)/((1+x^2)*(x^2+x1))


PROG

Floretion Algebra Multiplication Program, FAMP Code: 4ibaseseq[B+H] with B =  .25'i + .25'j  .25i' + .25j' + k'  .5'kk'  .25'ik'  .25'jk'  .25'ki'  .25'kj'  .5e and H = + .75'ii' + .75'jj' + .75'kk' + .75e


CROSSREFS

Cf. A001638, A111569, A111570, A111571, A111573, A111574, A111575, A111576.
Sequence in context: A106611 A331523 A025261 * A046900 A270828 A325315
Adjacent sequences: A111569 A111570 A111571 * A111573 A111574 A111575


KEYWORD

easy,sign


AUTHOR

Creighton Dement, Aug 10 2005


STATUS

approved



