OFFSET
1,5
LINKS
Peter Steinbach, Field Guide to Simple Graphs, Volume 4, Part 1 (For Volumes 1, 2, 3, 4 of this book see A000088, A008406, A000055, A000664, respectively.)
EXAMPLE
Triangle begins:
1,
1,1,
1,2,2,
1,3,4,3,
1,4,7,8,6,
1,6,15,16,19,11,
1,7,24,34,44,44,23,
1,9,38,71,97,122,112,47,
1,11,61,133,211,295,371,287,106,
1,13,90,249,457,659,1015,1131,763,235,
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
N. J. A. Sloane, Mar 18 2017
STATUS
approved