A070770 - OEIS

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A070770

b + c + d where b >= c >= d >= 0 ordered by b then c then d.

0, 1, 2, 3, 2, 3, 4, 4, 5, 6, 3, 4, 5, 5, 6, 7, 6, 7, 8, 9, 4, 5, 6, 6, 7, 8, 7, 8, 9, 10, 8, 9, 10, 11, 12, 5, 6, 7, 7, 8, 9, 8, 9, 10, 11, 9, 10, 11, 12, 13, 10, 11, 12, 13, 14, 15, 6, 7, 8, 8, 9, 10, 9, 10, 11, 12, 10, 11, 12, 13, 14, 11, 12, 13, 14, 15, 16, 12, 13, 14, 15, 16, 17, 18, 7

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,3

LINKS

Robert Israel, Table of n, a(n) for n = 0..10000

FORMULA

a(n) = A056556(n) + A056557(n) + A056558(n).

MAPLE

seq(seq(seq(b+c+d, d=0..c), c=0..b), b=0..10); # Robert Israel, Jun 21 2018

PROG

(PARI) for(x=0, 5, for(y=0, x, for(z=0, y, print1(x+y+z", ")))) \\ Charles R Greathouse IV, Sep 17 2015

CROSSREFS