A130269 -id:A130269 - cp's OEIS frontend

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A130270 Triangle read by rows, T(n) followed by 1, 2, 3, ..., n-1.

Original entry on oeis.org

1, 3, 1, 6, 1, 2, 10, 1, 2, 3, 15, 1, 2, 3, 4, 21, 1, 2, 3, 4, 5, 28, 1, 2, 3, 4, 5, 6, 36, 1, 2, 3, 4, 5, 6, 7, 45, 1, 2, 3, 4, 5, 6, 7, 8

Offset: 1

Gary W. Adamson, May 18 2007

Row sums = n^2.

			First few rows of the triangle:
   1;
   3, 1;
   6, 1, 2;
  10, 1, 2, 3;
  15, 1, 2, 3, 4;
  ...
Row 4 = (10, 1, 2, 3) = differences of row 4 of A130269: (10, 11, 13, 16).

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Cf. A000217, A130269.

Table[Join[{(n(n+1))/2,Range[n-1]}],{n,10}]//Flatten (* Harvey P. Dale, Dec 31 2021 *)

Triangle read by rows, T(n) followed by 1,2,3,...,n-1. Row differences of triangle A130269 starting from the left.

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