OFFSET
1,2
COMMENTS
All terms on row n are divisible by n. See A051850.
EXAMPLE
n-th row has length 2^(n-1) (A000079[n-1]) 1; 2, 4; 3, 6, 9, 21; 4, 8, 12, 16, 32, 36, 56, 156; 3 can be written as sum like 3, or 1+2 or 2+1 or 1+1+1. Numbers 3, 12, 21 and 111 interpreted in base 4 give the third row of table: 3,6,9,21
MAPLE
with(combinat); rows_upto_u := proc(u) local a, n; a := []; for n from 1 to u do a := [op(a), op(sort(map(list_in_base_b, map(op, map(permute, partition(n))), (n+1))))]; od; RETURN(a); end; # list_in_base_b given in A051845.
CROSSREFS
KEYWORD
easy,nonn,tabf,base
AUTHOR
Antti Karttunen, Dec 13 1999
EXTENSIONS
Definition corrected by Franklin T. Adams-Watters, Nov 20 2006
STATUS
approved