Sharedsupport / 2015-03-31-183729-triangle.sagewsOpen in CoCalc
Examples for support purposes...
f(n) = n*(n+1)/2

f(5)

15
for i in [1..10]:
print i, f(i)

1 1 2 3 3 6 4 10 5 15 6 21 7 28 8 36 9 45 10 55