OFFSET
1,5
COMMENTS
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..100
EXAMPLE
First 20 rows of array:
1
1 1
1 2
1 3 1
1 3 3
1 6 4
1 4 10
1 6 14 1
1 8 17 4
1 8 27 6
1 6 36 13
1 13 42 21
1 7 58 35
1 10 72 52
1 15 75 84 1
1 12 106 107 5
1 9 119 159 9
1 19 142 204 19
1 10 164 283 32
1 16 199 360 51
Row 5: the 7 partitions of 5 are shown here with difference sets:
partition difference set size
[5] null 0
[4,1] {3} 1
[3,2] {1} 1
[3,1,1] {0,2} 2
[2,2,1] {0,1} 2
[2,1,1,1] {0,1} 2
[1,1,1,1] {0} 1
Row 5 of the array is 1 3 3, these being the number of 0's, 1's, 2's in the "size" column.
MATHEMATICA
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Dec 26 2016
STATUS
approved