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A024394
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a(n) = sum of squares of first n positive integers congruent to 2 mod 3.
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0
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4, 29, 93, 214, 410, 699, 1099, 1628, 2304, 3145, 4169, 5394, 6838, 8519, 10455, 12664, 15164, 17973, 21109, 24590, 28434, 32659, 37283, 42324, 47800, 53729, 60129, 67018, 74414, 82335, 90799, 99824, 109428, 119629, 130445, 141894, 153994, 166763, 180219
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Binomial transform of 0, 4, 21, 18, 0, 0, 0, 0,...
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (4,-6,4,-1)
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FORMULA
| a(n) = 3*n^3+3*n^2/2-n/2. G.f. x*(4+13*x+x^2) / (x-1)^4 . - R. J. Mathar, Oct 08 2011
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CROSSREFS
| Sequence in context: A042379 A184301 A192025 * A199399 A095670 A200069
Adjacent sequences: A024391 A024392 A024393 * A024395 A024396 A024397
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KEYWORD
| nonn
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AUTHOR
| Clark Kimberling (ck6(AT)evansville.edu)
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