261800

Appears in sequences

• Number of diagonal dissections of an n-gon into 4 regions.at n=15A033276
• Number of pairs of sets of cardinality at least 3.at n=18A052516
• Numbers k not divisible by 6 such that sigma(k) > 3*k.at n=21A126104
• a(n) = E(k)*C(n+k,k) = Euler(k)*binomial(n+k,k) for k=4.at n=31A154286
• Numbers k such that prime(k) divides k^k - 1.at n=6A225944
• Row "sums" of Pascal triangle (A007318), using operation <+> defined in comment in A245618.at n=18A249779
• Number of 2n-move closed knight paths on an unbounded chessboard from a given square to the same square.at n=4A254129
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 601", based on the 5-celled von Neumann neighborhood.at n=17A289774