Legendre-binomial transform of 3^n for p=3.

Terms

a(0) =1a(1) =4a(2) =7a(3) =28a(4) =112a(5) =196a(6) =703a(7) =2812a(8) =4921a(9) =19684a(10) =78736a(11) =137788a(12) =551152a(13) =2204608a(14) =3858064a(15) =13837852a(16) =55351408a(17) =96864964a(18) =387400807a(19) =1549603228a(20) =2711805649a(21) =10847222596a(22) =43388890384a(23) =75930558172a(24) =272342767321