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A195311 Row sums of A195310. 3
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 (list; graph; refs; listen; history; text; internal format)
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, n-k*(3*k-1)/2)+max(0, n-k*(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

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Last modified November 13 13:15 EST 2018. Contains 317149 sequences. (Running on oeis4.)