Matrix 7th power of inverse partition triangle A038498.

Terms

a(0) =1a(1) =-7a(2) =1a(3) =21a(4) =-7a(5) =1a(6) =-7a(7) =14a(8) =-7a(9) =1a(10) =-77a(11) =14a(12) =14a(13) =-7a(14) =1a(15) =77a(16) =-63a(17) =7a(18) =14a(19) =-7a(20) =1a(21) =105a(22) =-7a(23) =-42a(24) =7a(25) =14a(26) =-7a(27) =1a(28) =-71a(29) =98