19958401

Appears in sequences

• a(n) = (n!+2)/2.at n=9A139149
• a(n)=(prime(n)!+2)/2.at n=4A139160
• Solution of the complementary equation a(n) = a(n-1)*b(n-2) - n, where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4.at n=10A294384