a(2*k-1) = (2*k-1)^2 + 2 - k, a(2*k) = 6*k^2 + 2 - k: First column of the triangle A093915.

Terms

a(0) =2a(1) =7a(2) =9a(3) =24a(4) =24a(5) =53a(6) =47a(7) =94a(8) =78a(9) =147a(10) =117a(11) =212a(12) =164a(13) =289a(14) =219a(15) =378a(16) =282a(17) =479a(18) =353a(19) =592a(20) =432a(21) =717a(22) =519a(23) =854a(24) =614a(25) =1003a(26) =717a(27) =1164a(28) =828a(29) =1337