OFFSET
3,1
REFERENCES
V. I. Bolshakov, On spectrum of permanent on Lambda_n^k, Proc. of Seminar on Discrete Math. and Appl., Moscow State Univ. (1986), 65-73 (in Russian).
LINKS
V. S. Shevelev, Some problems of the theory of enumerating the permutations with restricted position, Journal of Soviet Mathematics, 61 (4) (1992) 2272-2317 (see pp. 2307-2309).
EXAMPLE
Triangle begins:
6
9
12, 13
17, 18, 20, 36
24, 25, 26, 27, 30, 31, 32, 54,
33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 44, 45, 48, 49, 52, 72, 78, 81
CROSSREFS
KEYWORD
nonn,tabf,hard,more
AUTHOR
Vladimir Shevelev, Feb 19 2011
STATUS
approved