A162613 Triangle read by rows in which row n lists n terms, starting with n, with gaps = n^2-1 between successive terms.

1, 2, 5, 3, 11, 19, 4, 19, 34, 49, 5, 29, 53, 77, 101, 6, 41, 76, 111, 146, 181, 7, 55, 103, 151, 199, 247, 295, 8, 71, 134, 197, 260, 323, 386, 449, 9, 89, 169, 249, 329, 409, 489, 569, 649, 10, 109, 208, 307, 406, 505, 604, 703, 802, 901, 11, 131, 251, 371, 491, 611

Offset

1,2

Comments

Note that the last term of the n-th row is A100104(n).

Links

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

Example

Triangle begins:
  1;
  2,   5;
  3,  11,  19;
  4,  19,  34,  49;
  5,  29,  53,  77, 101;
  6,  41,  76, 111, 146, 181;

Mathematica

Table[NestList[#+n^2-1&, n, n-1], {n, 11}]//Flatten (* Harvey P. Dale, Feb 24 2016 *)

Crossrefs

Cf. A000578, A100104, A159797, A159798, A162610, A162611, A162612.

Cf. A100855 (row sums). - R. J. Mathar, Jul 20 2009

Sequence in context: A129198 A122442 A225258 * A120858 A124937 A279342

Adjacent sequences: A162610 A162611 A162612 * A162614 A162615 A162616

Keyword

easy,nonn,tabl

Author

Omar E. Pol, Jul 09 2009

Extensions

More terms from Vincenzo Librandi, Aug 02 2010

Status

approved