68264

Appears in sequences

• a(n) = (2*n - 1)*(11*n^2 - 11*n + 6)/6.at n=26A063492
• Numbers k such that sopf(k) + 1 = sopf(k+1), where sopf(k) = A008472(k).at n=38A064111
• Structured pentagonal hexacontahedral numbers (vertex structure 16).at n=13A100169
• The Wiener index of a chain of n squares joined at vertices (i.e., joined like <><><>...<>; here <> is a square!).at n=27A143943
• Number of binary strings of length n with equal numbers of 00100 and 10011 substrings.at n=17A164241
• Members of a pair (m,k) such that sigma(m) = sigma(k) = sigma(m+k), m < k where sigma = A000203.at n=32A239436
• Number of (n+2)X(3+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two sums of the central column and central row nondecreasing horizontally and vertically.at n=17A258521
• Number of ways to place m nonattacking queens on an m X n board, 1 <= m <= n (triangular array).at n=76A269133
• Numbers k such that A008475(k)+1 = A008475(k+1).at n=44A333801
• Numbers k such that k, k+1 and k+2 have exactly 4 distinct prime factors.at n=11A364309