18099

Appears in sequences

• Number of polyiamonds with n cells without holes that do not tile the plane.at n=13A071334
• Roman numerals for n evaluated as if in Sallows' base 27.at n=15A073427
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 0, 1), (0, 1, 0), (1, 0, 1), (1, 1, 0)}.at n=7A151127
• Number of permutations of 1..n containing the relative rank sequence { 126453 } at any spacing.at n=3A159088
• Number of permutations of 1..n containing the relative rank sequence { 134562 } at any spacing.at n=3A159094
• Number of permutations of 1..n containing the relative rank sequence { 164523 } at any spacing.at n=3A159137
• The number of central quasigroups (also known as T-quasigroups, or quasigroups affine over an abelian group) of order n, up to isomorphism.at n=48A260645
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 65", based on the 5-celled von Neumann neighborhood.at n=29A270085
• Number of Motzkin trees that are "typable closed terms".at n=10A300127
• Number of partitions of n in which the sequence of the sum of the same summands is nondecreasing.at n=48A304405
• Number of weakly unimodal compositions of n in which the greatest part occurs exactly six times.at n=50A320317