# A023046 (b-file synthesized from sequence entry) 0 133496 1 1468457 2 17487988 3 224406930 4 3089233056 5 45440868120 6 711607724640 7 11824686110160 8 207863095910400 9 3854801333416320 10 75225258805132800 11 1541182421573625600 12 33078535427763302400 13 742312125779672448000 14 17385470058151215820800 15 424244381692864981248000