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A329505
Expansion of (1 + x)*(1 + 2*x - x^2) / (1 - x).
1
1, 4, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4
OFFSET
0,2
COMMENTS
Decimal expansion of 1309/9000. - Elmo R. Oliveira, May 07 2024
FORMULA
a(n) = 4 for n >= 3.
PROG
(PARI) Vec((1 + x)*(1 + 2*x - x^2) / (1 - x) + O(x^80)) \\ Colin Barker, Nov 21 2019
CROSSREFS
Row 2 of array in A329504.
Essentially the same as A000655.
Sequence in context: A031349 A200605 A036444 * A125583 A196619 A343954
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Nov 20 2019
STATUS
approved