a(n) = 841*n^3 + 261*n^2 + 28*n + 1.

Terms

a(0) =1a(1) =1131a(2) =7829a(3) =25141a(4) =58113a(5) =111791a(6) =191221a(7) =301449a(8) =447521a(9) =634483a(10) =867381a(11) =1151261a(12) =1491169a(13) =1892151a(14) =2359253a(15) =2897521a(16) =3512001a(17) =4207739a(18) =4989781a(19) =5863173a(20) =6832961a(21) =7904191a(22) =9081909a(23) =10371161a(24) =11776993a(25) =13304451