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4, 12, 28, 52, 84, 124, 172, 228, 292, 364, 444, 532, 628, 732, 844, 964, 1092, 1228, 1372, 1524, 1684, 1852, 2028, 2212, 2404, 2604, 2812, 3028, 3252, 3484, 3724, 3972, 4228, 4492, 4764, 5044, 5332, 5628, 5932, 6244, 6564, 6892, 7228, 7572, 7924, 8284
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Diagonal of a number spiral.
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LINKS
| Index entries for sequences related to linear recurrences with constant coefficients, signature (3,-3,1).
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FORMULA
| Equals 4*A002061. - Robert G. Wilson v.
a(n)=8*n+a(n-1)-8 (with a(1)=4) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 13 2010]
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EXAMPLE
| ..43.44.45.46.47.48.49.50...
..42.21.22.23.24.25.26.51...
..40.19..7..8..9.10.27.52...
..40.19..6..1..2.11.28....
..39.18..5..4..3.12.29
..38.17.16.15.14.13.30
..37.36.35.34.33.32.31
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MATHEMATICA
| Table[4(n^2 - n + 1), {n, 2, 47}] (* Robert G. Wilson v *)
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CROSSREFS
| Sequence in context: A178571 A192736 A109629 * A166019 A184633 A006000
Adjacent sequences: A112084 A112085 A112086 * A112088 A112089 A112090
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KEYWORD
| nonn,easy
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AUTHOR
| Jenny X. Chen (pookahead(AT)gmail.com), Nov 28 2005
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EXTENSIONS
| Edited and extended by Robert G. Wilson v (rgwv(at)rgwv.com), Nov 29 2005
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