17472840domain: NAppears in sequencesFibonacci sequence beginning 0, 21.at n=30A022355Numbers k such that k-1, k+1, 2*k-1, 2*k+1, 4*k-1 and 4*k+1 are all prime.at n=19A069175Maximal overhang that can be attained from a stack of blocks of lengths 1,2,...,n (denominators).at n=10A298021