60214

Appears in sequences

• Coefficient of x^5 in expansion of (1 + x + x^2)^n.at n=19A000574
• a(n) = self-convolution of row n of Catalan triangle (A008315).at n=11A027301
• Number of nonsquare rectangles on an n X n board.at n=21A052149
• Numbers equal to a permutation (or rearrangement) of the digits of the sum of their proper divisors (excluding the proper divisor 1). Rearrangements which cause leading zeros are excluded.at n=24A086248
• Number of n X 6 binary arrays without the pattern 0 1 diagonally or vertically.at n=10A188840
• Number of nX6 0..1 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.at n=6A224156
• Number of 7Xn 0..1 arrays with diagonals and rows unimodal and antidiagonals nondecreasing.at n=5A224163
• Number of partitions p of n not containing round((min(p) + max(p))/2) as a part.at n=44A238487
• Squarefree primitive abundant numbers (first definition: having only deficient proper divisors).at n=43A298973
• The primitive abundant numbers k (A071395) arranged by the decreasing values of their abundancy index sigma(k)/k.at n=27A307098
• Number of Catalan paths (nonnegative, starting and ending at 0, step +/-1) of 2*n steps which reach at least 6 at some point.at n=12A359311
• a(n) = Sum_{1 <= x_1, x_2, x_3 <= n} sigma( n/gcd(x_1, x_2, x_3, n) ).at n=13A373130
• a(n) = Sum_{1 <= x_1, x_2 <= n} sigma( ( n/gcd(x_1, x_2, n) )^2 ).at n=13A373132