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A172076 a(n) = n*(n+1)*(14*n-11)/6. 4
0, 1, 17, 62, 150, 295, 511, 812, 1212, 1725, 2365, 3146, 4082, 5187, 6475, 7960, 9656, 11577, 13737, 16150, 18830, 21791, 25047, 28612, 32500, 36725, 41301, 46242, 51562, 57275, 63395, 69936, 76912, 84337, 92225, 100590, 109446, 118807, 128687 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Generated by the formula n*(n+1)*(2*d*n-(2*d-3))/6 for d=7.

From Bruno Berselli, Dec 14 2010: (Start)

In fact, the sequence is related to A001106 by a(n) = n*A001106(n) - Sum_{k=0..n-1} A001106(k) and this is the case d=7 in the identity n*(n*(d*n-d+2)/2) - Sum_{k=0..n-1} k*(d*k-d+2)/2 = n*(n+1)*(2*d*n-2*d+3)/6.

Also 16-gonal (or hexadecagonal) pyramidal numbers.

Inverse binomial transform of this sequence: 0, 1, 15, 14, 0, 0 (0 continued). (End)

REFERENCES

E. Deza and M. M. Deza, Figurate numbers, World Scientific Publishing (2012), page 93. [From Bruno Berselli, Feb 13 2014]

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

B. Berselli, A description of the recursive method in Comments lines: website Matem@ticamente (in Italian), 2008.

Index to sequences related to pyramidal numbers.

Index to sequences related to pyramidal numbers

Index entries for linear recurrences with constant coefficients, signature (4,-6,4,-1).

FORMULA

G.f.: x*(1+13*x)/(1-x)^4. [Bruno Berselli, Dec 15 2010]

a(n) = Sum_{i=0..n} A051868(i). [Bruno Berselli, Dec 15 2010]

a(n) = Sum_{i=0..n-1} (n-i)*(14*i+1), with a(0)=0. [Bruno Berselli, Feb 10 2014]

MAPLE

A172076:=n->n*(n+1)*(14*n-11)/6; seq(A172076(n), n=0..50); # Wesley Ivan Hurt, Feb 26 2014

MATHEMATICA

LinearRecurrence[{4, -6, 4, -1}, {0, 1, 17, 62}, 50] (* Vincenzo Librandi, Mar 01 2012 *)

CROSSREFS

Cf. similar sequences listed in A237616.

Sequence in context: A226026 A195025 A010005 * A063522 A244973 A145850

Adjacent sequences:  A172073 A172074 A172075 * A172077 A172078 A172079

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Jan 25 2010

STATUS

approved

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Last modified May 23 18:42 EDT 2017. Contains 286926 sequences.