28263

Appears in sequences

• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 3 X 3 plus 2,1 2,2 2,3 1,2 3,2.at n=14A146001
• Number of unrooted binary leaf-multi-labeled trees with n leaves on the label set [2].at n=11A220826
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 617", based on the 5-celled von Neumann neighborhood.at n=28A273248
• Numbers k such that k and k+2 are both A000120-perfect numbers (A175522).at n=33A360639
• G.f.: Sum_{k>=0} x^(k*(k+1)/2) * Product_{j=1..k} 1/(1 - x^j)^3.at n=22A376707