41230

Appears in sequences

• Number of nonsquare rectangles on an n X n board.at n=19A052149
• Triangle read by rows: T(n,k) is the number of bicolored Dyck paths of semilength n and having k peaks of the form ud (0 <= k <= n). A bicolored Dyck path is a Dyck path in which each up-step is of two kinds: u and U.at n=40A114608
• Half the number of length n integer sequences with sum zero and sum of squares 6050.at n=3A157587
• a(n) = numerator of fraction whose decimal representation is (n).(1)(2)(3)...(n-1)(n)... with repeating part (1)(2)(3)...(n-1)(n).at n=3A172499
• Numbers n such that n = x + y, sigma_1(n) = sigma_1(x) + sigma_1(y) and sigma_2(n) = sigma_2(x) + sigma_2(y).at n=25A219033
• Let an integer with k+1 digits as n = d(k)*10^k + d(k-1)*10^(k-1) + ... + d(0)*10^0 and consider the transform T(n) = k*10^d(k) + (k-1)*10^d(k-1) + ... + 0*10^d(0). a(n) gives the fixed points of the transform T(n).at n=35A226767
• Irregular triangle read by rows: row n gives numbers of maximal chains of lengths n-1, n, n+1, ... in the Tamari lattice T_n.at n=37A282698