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1, 70, 495, 1820, 4845, 10626, 20475, 35960, 58905, 91390, 135751, 194580, 270725, 367290, 487635, 635376, 814385, 1028790, 1282975, 1581580, 1929501, 2331890, 2794155, 3321960, 3921225, 4598126, 5359095, 6210820, 7160245, 8214570
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,1000
Index to sequences with linear recurrences with constant coefficients, signature (5,-10,10,-5,1).
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FORMULA
| a(n) =n*A015219(n-1) =A000332(4n) =A060539(n, 4) =n*(2n-1)*(4n-1)*(4n-3)/3.
G.f. -x*(1+65*x+155*x^2+35*x^3) / (x-1)^5. - R. J. Mathar, Oct 03 2011
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PROG
| (PARI) { for (n=1, 1000, write("b060541.txt", n, " ", n*(2*n - 1)*(4*n - 1)*(4*n - 3)/3); ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 06 2009]
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CROSSREFS
| Cf. A000027, A000384, A006566.
Sequence in context: A163434 A154085 A007330 * A183715 A104475 A169712
Adjacent sequences: A060538 A060539 A060540 * A060542 A060543 A060544
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KEYWORD
| nonn,easy
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AUTHOR
| Henry Bottomley (se16(AT)btinternet.com), Apr 02 2001
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EXTENSIONS
| OFFSET changed from 0 to 1 by Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 06 2009
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