A321574 Row sums of A321623.

1, 4, 20, 108, 604, 3444, 19876, 115644, 676748, 3977316, 23451700, 138634764, 821221692, 4872734676, 28952250564, 172222729308, 1025461169772, 6110912705220, 36441840179284, 217450403367852, 1298228971572764, 7754336590794804, 46335720234364900

Offset

0,2

Links

Table of n, a(n) for n=0..22.

Formula

G.f.: 1/(sqrt(1 - 6*x + x^2) - x). - Philippe Deléham, Feb 05 2020

Mathematica

(* 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 *)

Crossrefs

Cf. A321623, A321620.

Sequence in context: A265084 A321111 A319321 * A225621 A375303 A020084

Adjacent sequences: A321571 A321572 A321573 * A321575 A321576 A321577

Keyword

nonn

Author

Peter Luschny, Nov 22 2018

Status

approved