OFFSET
1,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..190 (rows 1..19)
EXAMPLE
Triangle T(n,k) begins (n edges >= 1, k vertices >= 2):
1;
2, 0;
4, 1, 0;
6, 2, 1, 0;
9, 6, 3, 1, 0;
12, 14, 13, 4, 1, 0;
16, 28, 39, 22, 5, 1, 0;
20, 52, 112, 98, 39, 6, 1, 0;
25, 93, 281, 383, 236, 63, 8, 1, 0;
30, 152, 655, 1304, 1220, 515, 102, 9, 1, 0;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Andrew Howroyd, Feb 25 2023
STATUS
approved