21065
domain: N
Appears in sequences
- Number of squares on infinite chessboard at <= n knight's moves from a fixed square.at n=39A018836
- a(n) = T(n, 2*n-6), T given by A027926.at n=15A027929
- Numbers having four 1's in base 8.at n=32A043428
- a(n) = T(n,n-6), array T as in A055801.at n=31A055806
- (Sum of composites among next n numbers)-(sum of primes among next n numbers).at n=40A094338
- The partition function G(n,6).at n=9A148092
- Antidiagonal sums of A175105.at n=15A179807
- Number G(n,k) of set partitions of {1,...,n} into sets of size at most k; triangle G(n,k), n>=0, 0<=k<=n, read by rows.at n=51A229223
- a(n) = Sum_{k=0..floor(n/2)} binomial(3*n-k,n-2*k).at n=6A371742