40522

Appears in sequences

• a(n) = index of second occurrence of A161926(n) in A114381.at n=18A161927
• Floor(1/{(5+n^4)^(1/4)}), where {}=fractional part.at n=36A184629
• Number of 10 X 2 integer matrices with each row summing to zero, row elements in nondecreasing order, rows in lexicographically nondecreasing order, and the sum of squares of the elements <= 2*n^2 (number of collections of 10 zero-sum 2-vectors with total modulus squared not more than 2*n^2, ignoring vector and component permutations).at n=14A192711
• a(n) counts anti-chains of size three in "0,1,2" Motzkin trees on n edges.at n=6A335349
• Start with a 2 X n array of squares, join every vertex on top edge to every vertex on bottom edge; a(n) = one-half the number of cells.at n=26A355902