81606

Appears in sequences

• Numbers n such that 8*10^n + 5*R_n + 2 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=6A103085
• Number of nondecreasing arrangements of 5 nonzero numbers in -(n+3)..(n+3) with sum zero.at n=27A188335
• Number of ways to place 4n nonattacking kings on an 8 X 2n cylindrical chessboard.at n=5A194646
• Number of ways to place 6n nonattacking kings on a vertical cylinder 12 X 2n.at n=3A195594
• Expansion of Product_{k>=0} (1 + x^(4*k+3))^(4*k+3).at n=50A285339
• Triangle read by rows: T(n,r), 0 <= r <= n, is the number of idempotents of rank r in the twisted planar partition monoid PP_n^tau.at n=50A289620