



2, 11, 47, 191, 767, 3071, 12287, 49151, 196607, 786431, 3145727, 12582911, 50331647, 201326591, 805306367, 3221225471, 12884901887, 51539607551, 206158430207, 824633720831, 3298534883327, 13194139533311, 52776558133247
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OFFSET

0,1


LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (5,4).


FORMULA

a(n) = 4*a(n1)+3. a(n) = 5*a(n1)4*a(n2), n>1.
G.f. ( 2+x ) / ( (4*x1)*(x1) ).  R. J. Mathar, Oct 30 2011


PROG

(MAGMA) [3*4^n1: n in [0..30]]


CROSSREFS

Cf. A024036, A097743, A114569, A156760.
Sequence in context: A106980 A089682 A211671 * A178710 A050929 A019005
Adjacent sequences: A198690 A198691 A198692 * A198694 A198695 A198696


KEYWORD

nonn,easy


AUTHOR

Vincenzo Librandi, Oct 29 2011


STATUS

approved



