81344

Appears in sequences

• Theta series of any of the 5 extremal odd unimodular 32-dimensional lattices (with minimal norm 4).at n=4A029752
• a(4n+k) = 4a(4n+k-1)-6a(4n+k-2)+4a(4n+k-3), for k = 0,1,2; 2*a(4n+3) = 7a(4n+2)-8(4n+1)+2a(4n), with a(0) = a(1) = a(2) = 0, a(3) = 1.at n=20A132152
• Numbers k such that k and k^2 use only the digits 1, 3, 4, 6 and 8.at n=17A137026
• Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, -1), (0, 1), (1, 0)}.at n=12A151278
• Let d(n,k) be the n-th divisor of a number k. a(n) is the smallest k such that d(n+1,k+1) = d(n,k) + 1.at n=12A285883