Rectified heptapeton (6-simplex) numbers: the coefficient of x^(2n-2) in (1+x+x^2+...+x^(n-1))^7.

A179097

Rectified heptapeton (6-simplex) numbers: the coefficient of x^(2n-2) in (1+x+x^2+...+x^(n-1))^7.

Terms

    a(0) =0a(1) =1a(2) =21a(3) =161a(4) =728a(5) =2415a(6) =6538a(7) =15330a(8) =32292a(9) =62601a(10) =113575a(11) =195195a(12) =320684a(13) =507143a(14) =776244a(15) =1154980a(16) =1676472a(17) =2380833a(18) =3316089a(19) =4539157a(20) =6116880a(21) =8127119a(22) =10659902a(23) =13818630a(24) =17721340a(25) =22502025a(26) =28312011a(27) =35321391a(28) =43720516

External references