129108
domain: N
Appears in sequences
- A triangular array related to A077028 and distributing the values of A007582.at n=61A110552
- Amicable triples: numbers such that sigma(x) = sigma(y) = sigma(z) = x+y+z, x<y<z. We order these triples according to the common value of sigma. Sequence gives y numbers.at n=23A125491
- First differences (A131771) equal this sequence with terms repeated at positions: {m*(m+1)/2, m>=0}.at n=34A131770
- First differences (A131772) equal this sequence with zeros inserted at positions {m*(m+1)/2, m>=0}.at n=41A131771
- Partial sums (A131771) equal this sequence excluding zeros located at positions {m*(m+1)/2, m>=0}, with a(0)=1.at n=49A131772
- 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, 1, 1), (0, 1, -1), (0, 1, 0), (1, 0, 1)}.at n=9A150286
- G.f. A(x) satisfies A(x) = 1 + x*(1-x^3)^2*A(x)^2.at n=12A389894