editing

1;

1, 0;

1, 1, 0;

1, 1, 1, 1;

1, 2, 2, 2, 1;

1, 2, 4, 6, 3, 0;

1, 3, 6, 10, 9, 3, 0;

1, 3, 9, 19, 19, 9, 3, 1;

1, 4, 12, 28, 38, 28, 12, 4, 1;

1, 4, 16, 44, 66, 60, 40, 20, 5, 0;

1, 5, 20, 60, 110, 126, 100, 60, 25, 5, 0;

1, 5, 25, 85, 170, 226, 226, 170, 85, 25, 5, 1;

1, 6, 30, 110, 255, 396, 452, 396, 255, 110, 30, 6, 1;

approved

editing

Cf. A007318, A057711, A159916.

approved

editing

Cf. A007318, A159916.

approved

editing

approved

proposed

editing