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1, 4, 20, 108, 604, 3444, 19876, 115644, 676748, 3977316, 23451700, 138634764, 821221692, 4872734676, 28952250564, 172222729308, 1025461169772, 6110912705220, 36441840179284, 217450403367852, 1298228971572764, 7754336590794804, 46335720234364900
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OFFSET
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0,2
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LINKS
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Table of n, a(n) for n=0..22.
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FORMULA
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G.f.: 1/(sqrt(1 - 6*x + x^2) - x). - Philippe Deléham, Feb 05 2020
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MATHEMATICA
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(* The function RiordanSquare is defined in A321620. *)
LargeSchröder = (1 - x - Sqrt[1 - 6x + x^2])/(2x);
M = RiordanSquare[LargeSchröder, 23]; Map[Total, M]
(* Alternative: *)
CoefficientList[Series[1/(Sqrt[1-6x+x^2]-x), {x, 0, 22}], x] (* Stefano Spezia, Feb 05 2020 *)
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CROSSREFS
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Cf. A321623, A321620.
Sequence in context: A265084 A321111 A319321 * A225621 A020084 A325956
Adjacent sequences: A321571 A321572 A321573 * A321575 A321576 A321577
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KEYWORD
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nonn
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AUTHOR
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Peter Luschny, Nov 22 2018
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STATUS
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approved
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