40185

Appears in sequences

• a(1) = 1, a(2) = 2, next terms up to a(2n-1) are obtained by multiplying previous terms a(n-1) by n+1, a(n-2) by n+2 etc. a(2) by (2n-2) and a(1) by 2n-1. On similar lines a(2n) = 2n*a(2n-2), a(2n+1) = (2n+1)*a(2n-1) and so on.at n=46A109844
• Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.at n=10A317378
• Squares where A323811 gets stuck.at n=10A323815
• G.f. A(x) satisfies A(x) = 1 + x + x*(1 + x)^4*A(x)^3.at n=6A366241