216090

Appears in sequences

• Boustrophedon transform of 0, 1, 0, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144,... the Fibonacci numbers (F_0 = 0, F_1 = 1, A000045) with an erroneous term (F_2 = 0 instead of 1).at n=10A062122
• Number of endofunctions on n labeled points constructed from k rooted trees.at n=23A066324
• Numbers k such that 2^(k+1) - 1 is prime.at n=30A090748
• Exponents m such that 1-A065395(2^m) is a power of 2, where A065395(n) = sigma(phi(n)) - phi(sigma(n)).at n=35A092591
• Solutions y of the Mordell equation y^2 = x^3 - 3a^2 - 1 for a = 0,1,2, ... (solutions x are given by A053755).at n=30A173200
• Triangular array read by rows: T(n,k) is the number of functions f:{1,2,...,n} -> {1,2,...,n} that have exactly k nonrecurrent elements; n>=1, 0<=k<=n-1.at n=25A219694
• Terms of a particular integer decomposition of N^N.at n=31A243203
• Twisted variant of A276086 indexed by A328625.at n=51A328624
• Twisted variant of A276086 indexed by A328626.at n=51A328627
• a(n) = A276086(A328623(n)).at n=45A346233
• Irregular triangle T(n, k) = Product_{i=1..n} prime(i)^(k mod prime(i)), with n >= 0, and 0 <= k < A002110(n), read by rows.at n=50A391933