OFFSET
2,1
LINKS
EXAMPLE
Irregular triangle begins, starting at row 2:
3;
6, 7;
10, 12, 13, 14, 15;
20, 21, 24, 25, 26, 27, 28, 29, 30, 31;
36, 40, 41, 42, 43, 45, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63;
MAPLE
s:= proc(n) s(n):= `if`(n=1, [[1]], map(x->
[[x[], 0], [x[], 1]][], s(n-1))) end:
T:= proc(n) map (x-> add(x[i]*2^(nops(x)-i), i=1..nops(x)), select
(proc(l) local i; for i to iquo(nops(l), 2) do if l[1..i]=
l[i+1..2*i] then return true fi od; false end, s(n)))[] end:
seq (T(n), n=2..7); # Alois P. Heinz, Dec 04 2012
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Omar E. Pol, Dec 03 2012
STATUS
approved