973981

Appears in sequences

• Number of permutations P of {1,2,...,n} such that P(1)=1 and |P^-1(i+1)-P^-1(i)| equals 1 or 2 for i=1,2,...,n-1.at n=35A038718
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, -1), (0, 0, -1), (0, 1, -1), (1, 0, 1)}.at n=12A149100
• Position of 1/n in the ordering of the rationals given by application of the map t -> (1+t,-1/t), cf. A226130.at n=11A226274