Number of partitions of 2n into two sorts of parts having exactly n parts of the second sort.

A258471

Number of partitions of 2n into two sorts of parts having exactly n parts of the second sort.

Terms

    a(0) =1a(1) =3a(2) =11a(3) =41a(4) =155a(5) =590a(6) =2258a(7) =8677a(8) =33454a(9) =129335a(10) =501180a(11) =1945997a(12) =7569223a(13) =29487091a(14) =115029830a(15) =449288570a(16) =1756808604a(17) =6876430799a(18) =26940317004a(19) =105635470645a(20) =414528962220

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