21466
domain: N
Appears in sequences
- Number of (n+2)X(n+2) binary arrays with each 3X3 subblock singular.at n=1A186043
- Number of (n+2)X4 binary arrays with each 3X3 subblock singular.at n=1A186045
- T(n,k)=Number of (n+2)X(k+2) binary arrays with each 3X3 subblock singular.at n=4A186052
- Number of numbers k such that k < d(k)^(n/10), where d(k) is the number of divisors of k.at n=19A225738
- Number of decompositions of highly composite numbers (A002182) into unordered sums of two primes.at n=39A228943
- Number of (n+1) X (4+1) arrays of permutations of 0..n*5+4 with each element having directed index change 2,-1 1,0 2,1 0,-1 -2,-2 or -1,0.at n=4A264487
- T(n,k)=Number of (n+1)X(k+1) arrays of permutations of 0..(n+1)*(k+1)-1 with each element having directed index change 2,-1 1,0 2,1 0,-1 -2,-2 or -1,0.at n=32A264490
- Number of (5+1)X(n+1) arrays of permutations of 0..n*6+5 with each element having directed index change 2,-1 1,0 2,1 0,-1 -2,-2 or -1,0.at n=3A264493
- G.f. satisfies A(x) = (1 + x*A(x)) * (1 - x*A(x)^4).at n=11A364376
- Expansion of 1 / ( (1 - x)*(1 + 2*x)*(1 - 4*x) )^(1/3).at n=9A370781