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A323216 Main diagonal of A323212. 0
1, 1, 7, 56, 477, 4180, 37401, 339184, 3107583, 28691938, 266537777, 2488340790, 23326071990, 219416722056, 2070014554612, 19578402111888, 185583671757949, 1762564846962972, 16768616366059543, 159777503753057786, 1524516616304476102, 14564266581096857240 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..21.

MATHEMATICA

nmax = 21; T = PadRight[CoefficientList[# + O[y]^(nmax+1), y], nmax+1]& /@ CoefficientList[1 + 2 x (x+1)/(Sqrt[1 - 4 y] - 2 x (x+1) + 1) + O[x]^(nmax+1), x];

a[n_] := T[[n + 1, n + 1]];

Table[a[n], {n, 0, nmax}] (* Jean-Fran├žois Alcover, Jul 21 2019 *)

CROSSREFS

A323212.

Sequence in context: A126694 A305198 A264912 * A024091 A145302 A233669

Adjacent sequences:  A323213 A323214 A323215 * A323217 A323218 A323219

KEYWORD

nonn

AUTHOR

Peter Luschny, Mar 18 2019

STATUS

approved

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Last modified August 14 12:27 EDT 2020. Contains 336480 sequences. (Running on oeis4.)