78200

Appears in sequences

• 4-dimensional figurate numbers: a(n) = (6*n-2)*binomial(n+2,3)/4.at n=22A002419
• a(1)=11, If a(n-1)=abcde..., where a,b,c,d,e... are the digits, then a(n)=abcde...+a*bcde...+ab*cde...+abc*de...+abcd*e...+....at n=19A108722
• a(n) = 1 + (9960 + (6804 + (2464 + (735 + (175 + (21 + n)*n)*n)*n)*n)*n)*n/5040.at n=14A145129
• Number of ways to place 2 nonattacking knights on an n X n toroidal board.at n=19A172529
• Number of ways to place 2 nonattacking kings on an n X n toroidal board.at n=19A179403
• Expansion of x*(1 + 4*x + x^2)/((1 - x)^5*(1 + x)^4).at n=45A290055