33672

Appears in sequences

• Number of self-converse asymmetric semigroups of order n.at n=7A058106
• Number of compositions (ordered partitions) of n into n parts, allowing zeros, with distinct nonzero parts.at n=11A097965
• Numbers k such that (j^k + k^j) == 0 (mod k+j), j=2 case.at n=9A114977
• a(n) = (n^5 - 5*n^4 + 5*n^3 + 5*n^2 + 114*n + 120)/120.at n=22A161701
• Number of -n..n arrays x(0..3) of 4 elements with zero sum and no two consecutive zero elements.at n=17A199531
• Number of 5-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero and first differences in -n..n.at n=19A209033
• Numbers n such that (n^n+2^2)/(n+2) is an integer.at n=8A242875
• Number of nXnXn triangular 0..4 arrays with new values introduced in sequential zero-upwards order and exactly one inverted 2x2x2 triangle having values all different.at n=3A271242
• T(n,k)=Number of nXnXn triangular 0..k arrays with new values introduced in sequential zero-upwards order and exactly one inverted 2x2x2 triangle having values all different.at n=24A271246
• Oblong numbers n such that n - 1 and n + 1 are both semiprime.at n=33A276565
• Oblong numbers the product of whose digits are positive oblong numbers.at n=15A285079
• Number of labeled n-vertex 2-edge multigraphs that are neither crossing nor nesting.at n=24A326247
• Triangle read by rows: Take a hexagram with all diagonals drawn, as in A331908. Then T(n,k) = number of k-sided polygons in that figure for k = 3, 4, ..., n+5.at n=15A331909
• Number of compositions of n where each part after the first is either twice or half the prior part.at n=61A342331