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A162612 Triangle read by rows in which row n lists n terms, starting with n^2+n-1, with gaps = n^2-1 between successive terms. 9
1, 5, 8, 11, 19, 27, 19, 34, 49, 64, 29, 53, 77, 101, 125, 41, 76, 111, 146, 181, 216, 55, 103, 151, 199, 247, 295, 343, 71, 134, 197, 260, 323, 386, 449, 512, 89, 169, 249, 329, 409, 489, 569, 649, 729, 109, 208, 307, 406, 505, 604, 703, 802, 901, 1000, 131, 251 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Note that the last term of the n-th row is the n-th cube A000578(n).

LINKS

Table of n, a(n) for n=1..57.

FORMULA

Sum_{k=1..n} T(n,k)= n*(n^3 + n^2 + n - 1)/2 (row sums). - R. J. Mathar, Jul 20 2009

EXAMPLE

Triangle begins:

   1;

   5,   8;

  11,  19,  27;

  19,  34,  49,  64;

  29,  53,  77, 101, 125;

  41,  76, 111, 146, 181, 216;

PROG

(PARI) T(n, k)=n+k*(n^2-1) \\ Franklin T. Adams-Watters, Aug 06 2009

CROSSREFS

Cf. A000578, A028387, A159797, A159798, A162610, A162611, A162613.

Sequence in context: A314399 A175319 A154486 * A314400 A314401 A237434

Adjacent sequences:  A162609 A162610 A162611 * A162613 A162614 A162615

KEYWORD

easy,nonn,tabl

AUTHOR

Omar E. Pol, Jul 09 2009

EXTENSIONS

More terms from Franklin T. Adams-Watters, Aug 06 2009

STATUS

approved

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Last modified August 13 06:22 EDT 2020. Contains 336442 sequences. (Running on oeis4.)