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A211483 Number of ordered triples (w,x,y) with all terms in {-n,...,0,...,n} and (w+n)^2=x+y. 2
1, 5, 10, 16, 22, 30, 38, 46, 55, 65, 75, 85, 95, 107, 119, 131, 143, 155, 168, 182, 196, 210, 224, 238, 252, 268, 284, 300, 316, 332, 348, 364, 381, 399, 417, 435, 453, 471, 489, 507, 525, 545, 565, 585, 605, 625, 645, 665, 685, 705, 726, 748, 770 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

For a guide to related sequences, see A211422.

LINKS

Table of n, a(n) for n=0..52.

MATHEMATICA

t[n_] := t[n] = Flatten[Table[(n + w)^2 - x - y, {w, -n, n}, {x, -n, n}, {y, -n, n}]]

c[n_] := Count[t[n], 0]

t = Table[c[n], {n, 0, 70}]  (* A211483 *)

CROSSREFS

Cf. A211422.

Sequence in context: A313932 A313933 A313934 * A313935 A313936 A313937

Adjacent sequences:  A211480 A211481 A211482 * A211484 A211485 A211486

KEYWORD

nonn

AUTHOR

Clark Kimberling, Apr 12 2012

STATUS

approved

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Last modified September 25 18:12 EDT 2021. Contains 347659 sequences. (Running on oeis4.)