n times the n-th n-gonal number.

Terms

a(0) =0a(1) =2a(2) =6a(3) =24a(4) =80a(5) =210a(6) =462a(7) =896a(8) =1584a(9) =2610a(10) =4070a(11) =6072a(12) =8736a(13) =12194a(14) =16590a(15) =22080a(16) =28832a(17) =37026a(18) =46854a(19) =58520a(20) =72240a(21) =88242a(22) =106766a(23) =128064a(24) =152400a(25) =180050a(26) =211302a(27) =246456a(28) =285824a(29) =329730