1106560

Appears in sequences

• Triple factorial numbers (3*n-2)!!! with leading 1 added.at n=7A007559
• Triple factorial numbers a(n) = n!!!, defined by a(n) = n*a(n-3), a(0) = a(1) = 1, a(2) = 2. Sometimes written n!3.at n=19A007661
• Triangle read by rows, the Bell transform of the triple factorial numbers A007559(n+1) without column 0.at n=21A035469
• a(n) = (n+1)*a(n-3), a(0)=a(1)=a(2)=1 for n>1.at n=18A081406
• A certain partition array in Abramowitz-Stegun (A-St) order.at n=29A134149
• A certain partition array in Abramowitz-Stegun order (A-St order), called M_3(4)/M_3.at n=29A134150
• A certain partition array in Abramowitz-Stegun order (A-St order), called M_3(4)/M_3.at n=45A134150
• Triangle of numbers obtained from the partition array A134150.at n=21A134151
• Triple factorial array, read by antidiagonals, where row n+1 is generated from row n by first removing terms in row n at positions {[m*(m+5)/6], m >= 0} and then taking partial sums, starting with all 1's in row 0.at n=28A136212
• Triple factorial array, read by antidiagonals, where row n+1 is generated from row n by first removing terms in row n at positions {[m*(m+5)/6], m >= 0} and then taking partial sums, starting with all 1's in row 0.at n=48A136212
• Triangle U, read by rows, where U(n,k) = Product_{j=k..n-1} (3*j+1) for n > k with U(n,n) = 1.at n=28A136214
• Triangle U, read by rows, where U(n,k) = Product_{j=k..n-1} (3*j+1) for n > k with U(n,n) = 1.at n=29A136214
• Triangle T, read by rows, where T(n,k) = A007559(n-k)*C(n,k) where A007559 equals the triple factorials in column 0.at n=28A136215
• Square array T(n,m) = Product_{i=0..m} (1+n*i) read by antidiagonals.at n=48A142589
• Triangle, read by rows, T(n,k) = k^(n+1) * Pochhammer(1/k, n+1).at n=17A153274
• A partition product of Stirling_2 type [parameter k = -4] with biggest-part statistic (triangle read by rows).at n=27A157398
• Triple factorials n!!!: a(n) = n*a(n-3).at n=19A161474
• a(n) = Product_{k in M_n} k, M_n = {k | 1 <= k <= 3n and k mod 3 = n mod 3}.at n=7A190903
• Triangle read by rows, a(n,k), n>=k>=1, which represent the s=3, h=1 case of a two-parameter generalization of Stirling numbers arising in conjunction with normal ordering.at n=28A203412
• Triangle S(n,k) by rows: coefficients of 3^((n-1)/2)*(x^(1/3)*d/dx)^n when n=1,3,5,...at n=21A223525