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A074364 Semi-tribonacci numbers, from tribonacci by analogy with semi-fibonacci sequence. 2
0, 1, 1, 2, 1, 4, 2, 7, 1, 10, 4, 15, 2, 21, 7, 30, 1, 38, 10, 49, 4, 63, 15, 82, 2, 99, 21, 122, 7, 150, 30, 187, 1, 218, 38, 257, 10, 305, 49, 364, 4, 417, 63, 484, 15, 562, 82, 659, 2, 743, 99, 844, 21, 964, 122, 1107, 7, 1236, 150, 1393, 30, 1573, 187, 1790, 1, 1978, 218 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

T. D. Noe, Table of n, a(n) for n = 0..10000

M. J. Halm, Sequences

FORMULA

a(0) = 0, a(1) = 1, a(2n) = a(n), a(2n+1) = a(2n)+a(2n-1)+a(2n-2)

EXAMPLE

a(4)=1 because a(4/2)=a(2)=1.

CROSSREFS

Cf. A030067, A000073.

Sequence in context: A239960 A205685 A143375 * A256610 A276055 A252866

Adjacent sequences:  A074361 A074362 A074363 * A074365 A074366 A074367

KEYWORD

nonn

AUTHOR

Michael Joseph Halm, Feb 13 2003

STATUS

approved

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Last modified March 30 20:18 EDT 2017. Contains 284302 sequences.