118110

Appears in sequences

• 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, 1), (-1, 0, 0), (0, 1, -1), (1, 0, 0), (1, 0, 1)}.at n=9A150394
• a(1)=1; for n>1, a(n) is the smallest positive integer for which sigma(a(n)) is a proper multiple of sigma(a(n-1)).at n=17A237352
• Expansion of (x+4*x^4)/(1-x-x^2-x^4-2*x^5-x^8).at n=20A270879