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A264854
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a(n) = n*(n + 1)*(11*n^2 + 11*n - 10)/24.
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3
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0, 1, 14, 61, 175, 400, 791, 1414, 2346, 3675, 5500, 7931, 11089, 15106, 20125, 26300, 33796, 42789, 53466, 66025, 80675, 97636, 117139, 139426, 164750, 193375, 225576, 261639, 301861, 346550, 396025, 450616, 510664, 576521, 648550, 727125, 812631, 905464, 1006031
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OFFSET
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0,3
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COMMENTS
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Partial sums of centered 11-gonal (or hendecagonal) pyramidal numbers.
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LINKS
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Table of n, a(n) for n=0..38.
OEIS Wiki, Figurate numbers
Eric Weisstein's World of Mathematics, Pyramidal Number
Index entries for linear recurrences with constant coefficients, signature (5,-10,10,-5,1).
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FORMULA
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G.f.: x*(1 + 9*x + x^2)/(1 - x)^5.
a(n) = Sum_{k = 0..n} A004467(k).
a(n) = 5*a(n-1) - 10*a(n-2) + 10*a(n-3) - 5*a(n-4) + a(n-5). - Vincenzo Librandi, Nov 27 2015
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MATHEMATICA
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Table[n (n + 1) (11 n^2 + 11 n - 10)/24, {n, 0, 50}]
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PROG
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(MAGMA) [n*(n+1)*(11*n^2+11*n-10)/24: n in [0..50]]; // Vincenzo Librandi, Nov 27 2015
(PARI) a(n)=n*(n+1)*(11*n^2+11*n-10)/24 \\ Charles R Greathouse IV, Jul 26 2016
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CROSSREFS
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Cf. A004467.
Cf. similar sequences provided by the partial sums of centered k-gonal pyramidal numbers: A006522 (k=1), A006007 (k=2), A002817 (k=3), A006325 (k=4), A006322 (k=5), A000537 (k=6), A006323 (k=7), A006324 (k=8), A236770 (k=9), A264853 (k=10), this sequence (k=11), A062392 (k=12), A264888 (k=13).
Sequence in context: A051799 A164540 A140184 * A189948 A252255 A025415
Adjacent sequences: A264851 A264852 A264853 * A264855 A264856 A264857
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KEYWORD
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nonn,easy
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AUTHOR
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Ilya Gutkovskiy, Nov 26 2015
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STATUS
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approved
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