Odd tetrahedral numbers: a(n) = (4*n+1)*(4*n+2)*(4*n+3)/6.

Terms

a(0) =1a(1) =35a(2) =165a(3) =455a(4) =969a(5) =1771a(6) =2925a(7) =4495a(8) =6545a(9) =9139a(10) =12341a(11) =16215a(12) =20825a(13) =26235a(14) =32509a(15) =39711a(16) =47905a(17) =57155a(18) =67525a(19) =79079a(20) =91881a(21) =105995a(22) =121485a(23) =138415a(24) =156849a(25) =176851a(26) =198485a(27) =221815a(28) =246905a(29) =273819