OFFSET
1,3
EXAMPLE
n-th row has length 2^(n-1) (A000079[n-1]) 1; 1,2; 1,2,3,7; 1,2,3,4,8,9,14,39; 1,2,3,4,5,9,10,11,16,17,23,52,53,59,95,311;
MAPLE
with(combinat); rows_upto_u := proc(u) local a, n; a := []; for n from 1 to u do a := [op(a), op(map(divby, sort(map(list_in_base_b, map(op, map(permute, partition(n))), (n+1))), n))]; od; RETURN(a); end; divby := (n, d) -> n/d;
CROSSREFS
KEYWORD
easy,nonn,tabf
AUTHOR
Antti Karttunen, Dec 13 1999
STATUS
approved