618710400

Appears in sequences

• a(n) = (3*n+4)*(n+3)!/24.at n=9A005460
• Commuting even permutations: number of ordered pairs g, h in the alternating group A_n such that gh = hg.at n=10A073584
• a(n) = 10^n - 9*9^n + 36*8^n - 84*7^n + 126*6^n - 126*5^n + 84*4^n - 36*3^n + 9*2^n - 1.at n=11A228912
• Partial products of A175317 (Sum_{d|n} pod(d)).at n=8A280115