Self-convolution 4th power equals A106220, which consists entirely of digits {0,1,2,3} after the initial terms {1,4}.

A106221

Self-convolution 4th power equals A106220, which consists entirely of digits {0,1,2,3} after the initial terms {1,4}.

Terms

    a(0) =1a(1) =1a(2) =-1a(3) =2a(4) =-4a(5) =10a(6) =-26a(7) =71a(8) =-199a(9) =569a(10) =-1652a(11) =4855a(12) =-14413a(13) =43153a(14) =-130143a(15) =394967a(16) =-1205268a(17) =3695771a(18) =-11381215a(19) =35183209a(20) =-109138163a(21) =339599993a(22) =-1059702401a(23) =3315256789a(24) =-10396158911a(25) =32671424776a(26) =-102879610571a(27) =324557399534

External references