81312

Appears in sequences

• Numbers k that divide the (left) concatenation of all numbers <= k written in base 23 (most significant digit on left).at n=27A029492
• Number of ways to place a non-attacking white and black knight on n X n chessboard.at n=16A035289
• Triangle whose (i,j)-th entry is binomial(i,j)*2^(i-j)*11^j.at n=30A038217
• Triangle whose (i,j)-th entry is binomial(i,j)*11^(i-j)*2^j.at n=33A038316
• Triangle T(n, k) = binomial(2*k, k)*binomial(n+k, n-k) + binomial(2*n-k, k)*binomial(2*(n-k), n-k), read by rows.at n=39A156763
• Triangle T(n, k) = binomial(2*k, k)*binomial(n+k, n-k) + binomial(2*n-k, k)*binomial(2*(n-k), n-k), read by rows.at n=41A156763
• Sigma(n) values in A115920.at n=33A216372
• Integer areas of the intangents triangle of integer-sided triangles.at n=16A231740
• Expansion of Product_{k>=1} ((1+x^k) / ((1-x^(2*k-1)) * (1-x^(8*k-4)))).at n=35A280908
• a(n) is the number of sparse rulers of length n where the length of the first segment is unique.at n=20A331330
• a(n) = A326127(n) * A389078(n).at n=71A388979