# A074359 (b-file synthesized from sequence entry) 0 0 1 0 2 0 3 0 4 12 5 64 6 280 7 1088 8 3968 9 13856 10 46912 11 155136 12 503616 13 1610496 14 5086336 15 15895552 16 49229312 17 151275008 18 461662208 19 1400356864 20 4224703488 21 12683452416 22 37911164928 23 112865394688 24 334788444160 25 989756825600