For odd n, this is the number of partitions of n*(n-1)/2 with all part sizes between 3 and n, inclusive. For even n, this is the number of partitions of n*(n-2)/2 with all part sizes between 3 and n, inclusive.

A176042

For odd n, this is the number of partitions of n*(n-1)/2 with all part sizes between 3 and n, inclusive. For even n, this is the number of partitions of n*(n-2)/2 with all part sizes between 3 and n, inclusive.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =20a(5) =42a(6) =238a(7) =511a(8) =3311a(9) =7423a(10) =52273a(11) =119739a(12) =894950a(13) =2087761a(14) =16317275a(15) =38616848a(16) =312598141a(17) =748492526a(18) =6233339701a(19) =15070028915a(20) =128475055100a(21) =313137867019

External references