OFFSET
1,4
EXAMPLE
Triangle starts with:
n=1: 1
n=2: 1, 1
n=3: 10, 3, 1
n=4: 215, 41, 6, 1
n=5: 12231, 1115, 105, 10, 1
n=6: 2025462, 74862, 3466, 215, 15, 1
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Max Alekseyev, Jan 04 2017
STATUS
approved