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A033121 Base 3 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,1. 0
1, 3, 10, 31, 93, 280, 841, 2523, 7570, 22711, 68133, 204400, 613201, 1839603, 5518810, 16556431, 49669293, 149007880, 447023641, 1341070923, 4023212770, 12069638311, 36208914933, 108626744800, 325880234401, 977640703203 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

LINKS

Index to sequences with linear recurrences with constant coefficients, signature (3,0,1,-3).

FORMULA

a(n) = 3a(n-1) + a(n-3) - 3a(n-4)

CROSSREFS

Sequence in context: A136846 A004663 A136853 * A180432 A192337 A106517

Adjacent sequences:  A033118 A033119 A033120 * A033122 A033123 A033124

KEYWORD

nonn,base,easy

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified February 17 08:21 EST 2012. Contains 205998 sequences.