cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A185730 Array by antidiagonals: T(n,k) = k*(k+1)*n*(n+1)*(k*n-n+2*k+7)/36.

Original entry on oeis.org

1, 4, 3, 10, 13, 6, 20, 34, 28, 10, 35, 70, 76, 50, 15, 56, 125, 160, 140, 80, 21, 84, 203, 290, 300, 230, 119, 28, 120, 308, 476, 550, 500, 350, 168, 36, 165, 444, 728, 910, 925, 770, 504, 228, 45, 220, 615, 1056, 1400, 1540, 1435, 1120, 696, 300, 55, 286, 825, 1470, 2040, 2380, 2401, 2100, 1560, 930, 385, 66, 364, 1078, 1980, 2850, 3480, 3724, 3528, 2940
Offset: 1

Views

Author

Clark Kimberling, Feb 01 2011

Keywords

Comments

This array is a member of a chain of arrays; it is the accumulation array of the array obtain by writing A125764 rectangularly
1...3....6....10...
2...7....15...26...
3...12...27...48...
and it is the weight array of A185731. (Weight and accumulation arrays are defined at A144112.)

Examples

			Northwest corner:
  1....4....10....20....35
  3....13...34....70....125
  6....28...76....160...290
  10...50...140...300...550
  15...80...230...500...925
		

Crossrefs

Programs

  • Mathematica
    f[n_,k_]:=k(1+k)n(1+n)(7+2k-n+k*n)/36;
    TableForm[Table[f[n,k],{n,1,10},{k,1,15}]]
    Table[f[n-k+1,k],{n,14},{k,n,1,-1}]//Flatten

Formula

T(n,k) = k*(k+1)*n*(n+1)*(k*n-n+2*k+7)/36.
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