Odd hexagonal pyramidal numbers.

Terms

a(0) =1a(1) =7a(2) =95a(3) =161a(4) =525a(5) =715a(6) =1547a(7) =1925a(8) =3417a(9) =4047a(10) =6391a(11) =7337a(12) =10725a(13) =12051a(14) =16675a(15) =18445a(16) =24497a(17) =26775a(18) =34447a(19) =37297a(20) =46781a(21) =50267a(22) =61755a(23) =65941a(24) =79625a(25) =84575a(26) =100647a(27) =106425a(28) =125077a(29) =131747