# A074092 (b-file synthesized from sequence entry) 0 1 1 2 2 8 3 40 4 144 5 448 6 1280 7 3456 8 8960 9 22528 10 55296 11 133120 12 315392 13 737280 14 1703936 15 3899392 16 8847360 17 19922944 18 44564480 19 99090432 20 219152384 21 482344960 22 1056964608 23 2306867200 24 5016387584 25 10871635968 26 23488102400