18151

Appears in sequences

• Number of positive integers <= 2^n of form x^2 + 8 y^2.at n=17A054152
• Number of connected ordered 2-element multiantichains on a labeled n-set.at n=9A094729
• a(n) = a(n-1) + a(n-3) + a(n-4), n >= 4, with initial terms 2,5,4,7.at n=19A111570
• Number of nondecreasing integer sequences of length 22 with sum zero and sum of absolute values 2n.at n=13A158156
• Number of permutations of 1..n containing the relative rank sequence { 145326 } at any spacing.at n=3A159115
• Number of compositions (ordered partitions) of n where no pair of adjacent part sizes is relatively prime.at n=30A178470
• Number of n X 2 0..1 arrays with rows, columns and antidiagonals unimodal and diagonals nondecreasing.at n=23A223764
• Numbers k such that 2^(3^j) == 1 (mod k) for some j.at n=7A318688
• The successive approximations up to 2^n for the 2-adic integer 7^(1/5).at n=15A325894
• The successive approximations up to 2^n for the 2-adic integer 7^(1/5).at n=16A325894
• The successive approximations up to 2^n for the 2-adic integer 7^(1/5).at n=17A325894
• The successive approximations up to 2^n for the 2-adic integer 7^(1/5).at n=18A325894
• The successive approximations up to 2^n for the 2-adic integer 7^(1/5).at n=19A325894
• a(n) is the number of edges formed by n-secting the angles of a heptagon.at n=28A335759