OFFSET
0,2
COMMENTS
5!*a(n) counts paths with n back-steps.
LINKS
J. Berestycki, É. Brunet, Z. Shi, Accessibility percolation with backsteps, arXiv preprint arXiv:1401.6894, 2014.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Mar 01 2014
STATUS
approved