17974

Appears in sequences

• Numbers k such that sigma(k) = sigma(k+11).at n=11A015881
• Sum of the lengths of the cycle types of the permutation created by length sorting on the partitions of n.at n=35A036056
• Number of ways to tile a 4 X n room with 1x2 Tatami mats. At most 3 Tatami mats may meet at a point.at n=54A068923
• Fourth column of (1,5)-Pascal triangle A096940.at n=42A096941
• a(n) = n*(n-3)*(n^2-7*n+14)/8.at n=19A176145
• G.f. 1/sum(k>=0, (-1)^k * x^(k*(k+1)/2)).at n=45A208061
• Number of ordered triples (w,x,y) with all terms in {1,...,n} and w^4>x^4+y^4.at n=39A211653
• Number of partitions of n which are not the partitions into (one or more) consecutive parts.at n=35A282467
• Number of palindromic plane trees with n nodes.at n=17A319436
• Products k of 4 distinct primes (or tetraprimes) such that k has no squarefree neighbors.at n=22A364141
• Products k of 4 distinct primes (or tetraprimes) such that none of k-2, k-1, k+1 and k+2 is squarefree.at n=9A364766
• a(n) = (n - 1) * Sum_{k=2..n} A000010(k).at n=38A385682