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0, 0, 1, 4, 7, 14, 17, 28, 35, 46, 53, 72, 79, 102, 113, 128, 143, 174, 185, 220, 235, 258, 277, 320, 335, 374, 397, 432, 455, 510, 525, 584, 615, 654, 685, 732, 755, 826, 861, 908, 939, 1018, 1041, 1124, 1163, 1210, 1253, 1344, 1375, 1458, 1497
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graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,4
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COMMENTS
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See A210000 for a guide to related sequences.
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LINKS
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Table of n, a(n) for n=0..50.
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MATHEMATICA
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a = 1; b = n; z1 = 50;
t[n_] := t[n] = Flatten[Table[w*z - x*y, {w, a, b}, {x, a, b}, {y, a, b}, {z, a, b}]]
c[n_, k_] := c[n, k] = Count[t[n], k]
Table[c[n, 0], {n, 0, z1}] (* A134506 *)
Table[c[n, 1], {n, 0, z1}] (* A196227 *)
%/2 (* A209978 *)
Table[2 c[n, 1], {n, 0, z1}](* A209979 *)
Table[c[n, 2], {n, 0, z1}] (* A197168 *)
%/2 (* A209980 *)
Table[c[n, 3], {n, 0, z1}] (* A210001 *)
Table[c[n, 4], {n, 0, z1}] (* A210002 *)
Table[c[n, 5], {n, 0, z1}] (* A210027 *)
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CROSSREFS
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Cf. A210000.
Sequence in context: A007437 A159912 A183060 * A049766 A161426 A115759
Adjacent sequences: A209975 A209976 A209977 * A209979 A209980 A209981
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KEYWORD
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nonn
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AUTHOR
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Clark Kimberling, Mar 16 2012
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STATUS
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approved
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