OFFSET
0,2
LINKS
Alois P. Heinz, Rows n = 0..200, flattened (first 16 rows from Chai Wah Wu)
D. Baccherini, D. Merlini, R. Sprugnoli, Binary words excluding a pattern and proper Riordan arrays, Discrete Math. 307 (2007), no. 9-10, 1021--1037. MR2292531 (2008a:05003).
EXAMPLE
Triangle begins:
1
2 1
6 3 1
20 10 4 1
70 35 15 5 1
248 123 54 20 6 1
894 442 198 78 26 7 1
3264 1611 732 300 108 33 8 1
...
PROG
(Python)
from itertools import combinations
A239103_list = []
for n in range(16):
for k in range(n, -1, -1):
c, d0 = 0, ['0']*(n+k)
for x in combinations(range(n+k), n):
d = list(d0)
for i in x:
d[i] = '1'
if not '1011101' in ''.join(d):
c += 1
A239103_list.append(c) # Chai Wah Wu, Sep 12 2014
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
N. J. A. Sloane, Mar 25 2014
EXTENSIONS
More terms from Chai Wah Wu, Sep 12 2014
STATUS
approved