Binomial transform of heptagonal numbers A000566.

Terms

a(0) =0a(1) =1a(2) =9a(3) =42a(4) =152a(5) =480a(6) =1392a(7) =3808a(8) =9984a(9) =25344a(10) =62720a(11) =152064a(12) =362496a(13) =851968a(14) =1978368a(15) =4546560a(16) =10354688a(17) =23396352a(18) =52494336a(19) =117047296a(20) =259522560a(21) =572522496a(22) =1257242624a(23) =2749366272a(24) =5989466112a(25) =13002342400a(26) =28135391232