a(n) + a(n+1) + a(n+2) = n^6, a(1)=a(2)=0.

Terms

a(0) =0a(1) =0a(2) =1a(3) =63a(4) =665a(5) =3368a(6) =11592a(7) =31696a(8) =74361a(9) =156087a(10) =300993a(11) =542920a(12) =927648a(13) =1515416a(14) =2383745a(15) =3630375a(16) =5376505a(17) =7770336a(18) =10990728a(19) =15251160a(20) =20803993a(21) =27944847a(22) =37017281a(23) =48417776a(24) =62600832a(25) =80084368a(26) =101455425a(27) =127375983