A071230 a(n) = n*(6*n^2 - 7*n + 3)/2.

0, 1, 13, 54, 142, 295, 531, 868, 1324, 1917, 2665, 3586, 4698, 6019, 7567, 9360, 11416, 13753, 16389, 19342, 22630, 26271, 30283, 34684, 39492, 44725, 50401, 56538, 63154, 70267, 77895, 86056, 94768, 104049, 113917, 124390, 135486

Offset

0,3

References

T. A. Gulliver, Sequences from Arrays of Integers, Int. Math. Journal, Vol. 1, No. 4, pp. 323-332, 2002.

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..2000

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

Formula

a(n) = 4*a(n-1) - 6*a(n-2) + 4*a(n-3) - a(n-4).

Mathematica

Table[n*(6*n^2 - 7*n + 3)/2, {n, 0, 40}]

Prog

(Magma) [n*(6*n^2-7*n+3)/2: n in [0..50]]; // Vincenzo Librandi, Jun 14 2011

Crossrefs

Sequence in context: A254895 A358166 A195024 * A027000 A198160 A029531

Adjacent sequences: A071227 A071228 A071229 * A071231 A071232 A071233

Keyword

nonn,easy

Author

N. J. A. Sloane, Jun 11 2002

Extensions

More terms from Robert G. Wilson v, Jun 12 2002

Status

approved