OFFSET
1,10
COMMENTS
A loop adds 2 to the degree of its vertex.
FORMULA
T(n,k) = T(n, n+1-k).
EXAMPLE
Triangle begins:
1, 0, 1;
1, 1, 1, 1;
1, 0, 2, 0, 1;
1, 3, 8, 8, 3, 1;
1, 0, 38, 0, 38, 0, 1;
1, 15, 208, 730, 730, 208, 15, 1;
1, 0, 1348, 0, 20670, 0, 1348, 0, 1;
1, 105, 10126, 188790, 781578, 781578, 188790, 10126, 105, 1;
...
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Andrew Howroyd, Mar 09 2020
STATUS
approved