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A119713 First differences are 2, 5, 5, 9, 9, 9, 14, 14, 14, 14, ..., that is, A000096 with m-th term repeated m times (m>=1). 0
0, 2, 7, 12, 21, 30, 39, 53, 67, 81, 95, 115, 135, 155, 175, 195, 222, 249, 276, 303, 330, 357, 392, 427, 462, 497, 532, 567, 602, 646, 690, 734, 778, 822, 866, 910, 954, 1008, 1062, 1116, 1170, 1224, 1278, 1332, 1386, 1440, 1505, 1570, 1635, 1700, 1765, 1830 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

David Pagni, Building buildings with triangular numbers, AMATYC Review (vol. 27 no. 2 spring 2006, pp. 56-65).

LINKS

Table of n, a(n) for n=0..51.

MATHEMATICA

a = 10; lst = {0}; s = 0; t = Flatten@ Table[ Table[n*(n + 3)/2, {n}], {n, a}]; Do[ AppendTo[lst, s = s + t[[n]]], {n, a(a+1)/2}]; lst - Robert G. Wilson v, Jun 16 2006

CROSSREFS

Sequence in context: A133459 A023669 A137401 * A213041 A135541 A180804

Adjacent sequences:  A119710 A119711 A119712 * A119714 A119715 A119716

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jun 13 2006

EXTENSIONS

More terms from Robert G. Wilson v, Jun 16 2006

STATUS

approved

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Last modified May 25 04:36 EDT 2017. Contains 287008 sequences.