76840

Appears in sequences

• a(n) = (2*n-1)*(n^2 -n +2)/2.at n=42A063488
• Number of partitions of n having no parts with multiplicity 3.at n=47A118807
• a(n) = number of digits in the decimal expansion of A046967(n).at n=6A135250
• Triangle read by rows: T(n,k) is the number of permutations of [n] having k-1 alternating descents (1<=k<=n). The index i is an alternating descent of a permutation p if either i is odd and p(i)>p(i+1), or i is even and p(i)<p(i+1).at n=40A145876
• Number of (n+2)X(n+2) 0..1 arrays with every 2X2 and 3X3 subblock diagonal maximum minus antidiagonal minimum unequal to its neighbors horizontally and vertically.at n=4A253359
• Number of (n+2)X(5+2) 0..1 arrays with every 2X2 and 3X3 subblock diagonal maximum minus antidiagonal minimum unequal to its neighbors horizontally and vertically.at n=4A253364
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 2X2 and 3X3 subblock diagonal maximum minus antidiagonal minimum unequal to its neighbors horizontally and vertically.at n=40A253367
• Numbers k such that (8*10^k + 43)/3 is prime.at n=21A293538
• Number of permutations of [n] having exactly four alternating descents.at n=4A302897
• Number of permutations of [2n+1] having exactly n alternating descents.at n=4A302903
• Number of permutations of [n] having exactly ceiling(n/2)-1 alternating descents.at n=9A302905
• Numbers k such that A011772(k) > A344878(k) and A011772(k) is a divisor of A344875(k).at n=30A344595