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A046531 Numerators of elements to right of central elements of 1/2-Pascal triangle (by row). 0
1, 1, 3, 1, 5, 1, 11, 7, 1, 9, 9, 1, 20, 27, 11, 1, 67, 19, 13, 1, 147, 105, 51, 15, 1, 126, 78, 33, 17, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..30.

Thomas M. Richardson, The three 'R's and Dual Riordan Arrays, arXiv:1609.01193 [math.CO], 2016.

EXAMPLE

1/1;

1/1 1/1;                               -->  1

1/1 1/2 1/1;                           -->  1

1/1 3/2 3/2 1/1;                       -->  3  1

1/1 5/2 3/1 5/2 1/1;                   -->  5  1

1/1 7/2 11/2 11/2 7/2 1/1;             --> 11  7 1

1/1 9/2 9/1 11/1 9/1 9/2 1/1;          -->  9  9 1

1/1 11/2 27/2 20/1 20/1 27/2 11/2 1/1; --> 20 27 11 1

CROSSREFS

Cf. A046213.

Sequence in context: A112031 A146285 A146059 * A289310 A160085 A147024

Adjacent sequences:  A046528 A046529 A046530 * A046532 A046533 A046534

KEYWORD

tabf,nonn,more

AUTHOR

Mohammad K. Azarian

STATUS

approved

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Last modified March 19 19:32 EDT 2019. Contains 321330 sequences. (Running on oeis4.)