10905190400domain: NAppears in sequencesa(n) = binomial(n,2) * 2^(n-1).at n=26A001815Fourth unsigned column of Lanczos triangle A053125 (decreasing powers).at n=11A054322A transform of C(n,3).at n=23A082138Denominators of a BBP-like formula for 4*Pi/sqrt(27).at n=8A260659