G.f. A(x) satisfies: 0 = Sum_{n=-oo..+oo} x^(n*(n-1)/2) * (x^n - A(x))^n.

A355861

G.f. A(x) satisfies: 0 = Sum_{n=-oo..+oo} x^(n*(n-1)/2) * (x^n - A(x))^n.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =12a(4) =37a(5) =121a(6) =419a(7) =1510a(8) =5604a(9) =21261a(10) =82110a(11) =321662a(12) =1275077a(13) =5104886a(14) =20611814a(15) =83834609a(16) =343164051a(17) =1412600336a(18) =5843868040a(19) =24283650452a(20) =101312783192a(21) =424212909937

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