OFFSET
1,1
FORMULA
EXAMPLE
The irregular triangle a(n,j) begins (z(n) = A337215(n)):
n, z(n) \ j 1 2 3 4 5 6 7 8 9 10 11 12 13 ...
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1, 5: 2
2, 8: 1
3, 9: 3
4, 10: 1 3
5, 13: 2 1
6, 16: 2 4 6
7, 17: 1 3 5 4
8, 18: 3
9, 20: 3 1 1 4 2 6 7
10, 25: 1 3 5 4 8 2
11, 26: 1 3 7 9 5
12, 29: 3 2 4 1 8 9 7 10
13, 32: 2 6 2 10 6
14, 34: 3 1 7 5 11
15, 36: 3 6 3 9 12 3 6 9 15
16: 37: 2 1 5 4 8 7 11 10 14 6
17, 40: 3 1 7 9 1 11 13 3 9
18, 41: 1 8 3 6 4 5 2 12 15 13 7 11 17
19, 45: 6 3 9 3 12 6 6 12 3 9
20, 49: 7 7 14 7 14
21, 50: 9 1 5 13 3 15 7
...
-----------------------------------------------------
a(6, 3) = 6 for the triangle from row n = 6 of A336888: (x(6)_5 , y(6)_6, z(6)) = (13, 13, 16), with area (in some square length units) (1/4)*sqrt(2*(16*13 + 16*13 + 13*13) - (2*13^2 +16^2)) = 6.
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Wolfdieter Lang, Aug 19 2020
STATUS
approved