51221

Appears in sequences

• Number of solid partitions of n supported on graph of cube.at n=32A003404
• 3-almost prime octagonal numbers.at n=27A129927
• Octagonal numbers which are the sums of exactly two positive octagonal numbers.at n=23A136346
• Number of ways to place 4 nonattacking kings on a 4 X n board.at n=10A172203
• Octagonal numbers with prime indices.at n=31A267144
• Terms of A324315 (squarefree integers m > 1 such that if prime p divides m, then the sum of the base p digits of m is at least p) that are also octagonal numbers (A000567) with index equal to their largest prime factor.at n=6A324320
• a(n) = n! * Sum_{k=0..floor(n/3)} (k+1)^(k-1) / (6^k * k! * (n-3*k)!).at n=10A362525
• Octagonal numbers that are the product of three distinct primes.at n=22A382231