46261

Properties

Appears in sequences

• Triangle read by rows: T(n,k) is the number of deco polyominoes of height n and vertical height (i.e., number of rows) k (1 <= k <= n). A deco polyomino is a directed column-convex polyomino in which the height, measured along the diagonal, is attained only in the last column.at n=43A121692
• Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1111-1111 pattern in any orientation.at n=13A146936
• Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1111-1111 pattern in any orientation.at n=28A146938
• Smallest m such that the period of the continued fraction of sqrt(m) is A215485(n); records of A013646.at n=29A215508
• G.f.: 1/(1+x) * Product_{k>=1} 1/(1-x^k)^k.at n=20A277963
• Primes that can be generated by the concatenation in base 2, in ascending order, of two consecutive integers read in base 10.at n=29A287018
• Primes that can be generated by the concatenation in base 4, in ascending order, of two consecutive integers read in base 10.at n=26A287302
• Primes p such that A001175(p) = (p-1)/9.at n=26A308794
• Prime numbersat n=4784