101409

Appears in sequences

• Triangle read by rows: T(n,k) (n>=2, k=0..n-1) gives number of biconnected graphs on n nodes with chromatic number n-k.at n=40A126749
• Number of biconnected graphs on n nodes with chromatic number 6.at n=9A126754
• 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, 1, -1), (1, -1, 1), (1, 1, 1)}.at n=9A149639
• Number of 5Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.at n=13A302167
• a(n) is the sum of the nonpowers of 2 in the 3x+1 sequence that starts at n.at n=26A347532