88690

Appears in sequences

• Number of n X 2 nonnegative integer arrays with upper left 0 and lower right n+2-4 and value increasing by 0 or 1 with every step right or down.at n=35A252870
• Numbers k such that 2^(k-1)*(2^k - 1) + 1 is prime (see A134169).at n=32A268692
• Number of permutations of [n] avoiding {2143, 3412, 1234}.at n=18A294709