23490

Appears in sequences

• a(n) = floor( n*(n-1)*(n-2)*(n-3)/28 ).at n=30A011938
• Numbers m such that m = Sum_{i=x..y} i = (10^k)*y + x, where 0 <= x < y, 0 <= x < 10^k for some positive integers k.at n=8A186076
• Number of (n+1) X (n+1) -7..7 symmetric matrices with every 2 X 2 subblock having sum zero and three distinct values.at n=9A211442
• Number of unordered unilabeled-bilabeled increasing trees.at n=7A261002
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 161", based on the 5-celled von Neumann neighborhood.at n=34A270452
• Triangle read by rows: T(n,k) is the number of multisets of k ternary words with a total of n letters.at n=40A275414
• Maximum second Zagreb index of maximal 3-degenerate graphs with n vertices.at n=43A372025