Number of nonnegative integer solutions to n = x_1 + x_2 + ... + x_(2*n) + 2*y_1 + 2*y_2 + ... + 2*y_(2*n).

A351857

Number of nonnegative integer solutions to n = x_1 + x_2 + ... + x_(2*n) + 2*y_1 + 2*y_2 + ... + 2*y_(2*n).

Terms

    a(0) =2a(1) =14a(2) =92a(3) =654a(4) =4752a(5) =35204a(6) =264112a(7) =2000526a(8) =15264866a(9) =117161264a(10) =903533380a(11) =6995547780a(12) =54343476072a(13) =423360920528

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