

A119713


First differences are 2, 5, 5, 9, 9, 9, 14, 14, 14, 14, ..., that is, A000096 with mth 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
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OFFSET

0,2


REFERENCES

David Pagni, Building buildings with triangular numbers, AMATYC Review (vol. 27 no. 2 spring 2006, pp. 5665).


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: A137401 A309150 A333354 * A213041 A293330 A135541
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



