



0, 1, 3, 5, 7, 10, 13, 17, 21, 25, 29, 33, 38, 43, 48, 54, 60, 66, 72, 78, 84, 90, 97, 104, 111, 118, 126, 134, 142, 150, 158, 166, 174, 182, 190, 199, 208, 217, 226, 235, 245, 255, 265, 275, 285, 295, 305, 315, 325, 335, 345, 356, 367, 378, 389, 400
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OFFSET

1,3


LINKS

Table of n, a(n) for n=1..56.


EXAMPLE

If written as an irregular triangle in which row n has length A026741(n+1) then the first differences in row n are always n (see below).
Triangle begins:
0,
1,3,5,
7,10,
13,17,21,25,29,
33,38,43,
48,54,60,66,72,78,84,
90,97,104,111,
118,126,134,142,150,158,166,174,182,
190,199,208,217,226,
235,245,255,265,275,285,295,305,315,325,335,
345,356,367,378,389,400


PROG

(Sage)
def A195311(n):
return add(max(0, nk*(3*k1)/2)+max(0, nk*(3*k+1)/2) for k in (1..n))
[A195311(n) for n in (1..56)] # Peter Luschny, Oct 12 2012


CROSSREFS

Cf. A001318, A026741, A195309, A195310.
Sequence in context: A029899 A072166 A077000 * A184013 A057672 A112509
Adjacent sequences: A195308 A195309 A195310 * A195312 A195313 A195314


KEYWORD

nonn


AUTHOR

Omar E. Pol, Sep 21 2011


STATUS

approved



