21463

Appears in sequences

• Number of partitions of n into prime power parts (1 included); number of nonisomorphic Abelian subgroups of symmetric group S_n.at n=43A023893
• a(n) = (3*n+1)*(4*n+1).at n=42A033577
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 1), (0, 0, 1), (1, -1, -1), (1, 1, 0)}.at n=8A150190
• Triangle defined by T(n,k) = T(n-1,k-1) + Sum_{j=k..n-2} T(n-1,j)*2^j*T(j,k-1) for n>k>0 with T(n,n)=T(n,0)=1, read by rows.at n=51A152795
• Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 5 X 5 X 5 subtriangle summing to 11.at n=10A154084
• Positive numbers y such that y^2 is of the form x^2 + (x+127)^2 with integer x.at n=10A159466
• Principal diagonal of the convolution array A213762.at n=9A213763
• Number of unlabeled graphs on n nodes whose components are cycles or complete graphs.at n=28A217067
• Small positive integer solutions of the simultaneous equations y = ax + b and y^2 = ax^3 + b.at n=26A262598
• Number of alternately co-strong integer partitions of n.at n=43A317256
• Nonsemiprimes in A306097 = A121707 \ A267999.at n=28A321488
• The smallest of 3 consecutive integers such that the first is divisible by the square of a prime, the second is divisible by the cube of a prime, and the third is divisible by the fourth power of a prime.at n=12A349952
• Number of n-digit zeroless numbers whose digit sum is larger than the product of all digits.at n=18A360972
• a(n) is the smallest number which can be represented as the sum of n distinct nonzero n-gonal numbers in exactly 2 ways.at n=16A377729