70552

Appears in sequences

• Group the triangular numbers so that the n-th group sum is a multiple of n. 1, (3, 6, 10, 15), (21), (28), (36, 45, 55, 66, 78), (91, 105, 120, 136, 153, 171, 190), ... Sequence contains n-th group sum divided by n.at n=38A114032
• Number of 3-step knight's tours on an (n+2) X (n+2) board summed over all starting positions.at n=35A186852
• Number of 4-step one or two space at a time bishop's tours on an n X n board summed over all starting positions.at n=16A187048
• Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any horizontal or vertical neighbor, and containing the value n(n+1)/2-2.at n=26A211905