Third row of Pascal-(1,7,1) array A081582.

Terms

a(0) =1a(1) =17a(2) =97a(3) =241a(4) =449a(5) =721a(6) =1057a(7) =1457a(8) =1921a(9) =2449a(10) =3041a(11) =3697a(12) =4417a(13) =5201a(14) =6049a(15) =6961a(16) =7937a(17) =8977a(18) =10081a(19) =11249a(20) =12481a(21) =13777a(22) =15137a(23) =16561a(24) =18049a(25) =19601a(26) =21217a(27) =22897a(28) =24641a(29) =26449