OFFSET
1,2
LINKS
Kassie Archer and Aaron Geary, Descents in powers of permutations, arXiv:2406.09369 [math.CO], 2024. See Table 5 p. 13.
EXAMPLE
Triangle begins:
1;
2, 0;
4, 2, 0;
10, 6, 6, 2;
26, 22, 48, 22, 2;
76, 68, 276, 260, 40, 0;
232, 214, 1384, 2204, 944, 62, 0;
...
PROG
(PARI) sq(p) = vector(#p, k, p[p[k]]);
nbd(p) = sum(i=1, #p-1, p[i+1] < p[i]);
row(n) = my(v=vector(n)); for (i=1, n!, v[nbd(sq(numtoperm(n, i)))+1]++; ); v;
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Michel Marcus, Jun 14 2024
STATUS
approved